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Linn Isobarik Drivers

<font face="Verdana, Arial, Helvetica" size="2"> <p>There is a lot of information concerning the drivers used in the Linn Isobarik loudspeaker; some of it confusing and some of it conflicting. I have attempted below to identify the model of those drivers actually used during the years of production. Variants I don't believe were used are listed for completeness. </p> <p>The bass driver is generically known as the KEF B139. Two of these are used in each loudspeaker, mounted front to back in a sealed enclosure called an isobaric chamber. These are also referred to as the B139 "racetrack" driver because of their shape. Some B139s have a copper coloured face but most appear to be black. I have seen one reference to an 8Ω B139C but can't find any details on it. In a table on comparative properties of materials, B139C is the number given to a phosphor bronze. Whether this has anything to do with the copper colouring used on the face of some B139s I don't know. </p> <p>You may occassionally see a photograph of a B139 with a board on the back of it; the board having a label stating SP1004. This is the number given to KEF's DN12 dividing network board and is not part of the loudspeaker. </p> <p>The midrange driver is generically known as the KEF B110. One is mounted on the front face of the loudspeaker, the other on the top face, firing upwards. </p> <p>In March 1983, Linn started painting sound deadening material onto the standard bass and midrange units supplied by KEF. On the bass unit, liberal coatings of a black car underseal like substance were painted on the legs of the chassis, not visible from outside the cabinet. On the midrange, Linn painted a doping material onto the front face. One of the forum members has used a good quality PVA glue to dope replacement units by laying them face up and brushing with a slightly watered down glue from the outside to the centre, and reports that the thin coat on the cone dries clear but the thicker coat around the dust cap remains a little whiteish. </p> <p>KEF B139 and B110 drivers are no longer in production. </p> <p>I have not included photographs of these units as there are countless examples on the sites listed below under sources. </p> <p>The original tweeter used was the Scan-Speak D2008. This was later changed to a Linn Products D20-LP-1, made by Hiquphon, which is recognisable by two concentric rings on the faceplate, with later models sporting a Linn logo on the front. Tweeter mounting uses the same layout as the midrange unit. The Scan-Speak tweeter is still produced but I have no information regarding changes to it's specification over the years. The Hiquphon unit is still made and is only available from Linn. Neither Linn nor Hiquphon are willing to supply the specification of this unit. </p> <p>Sources:<br /> john & Jake<br /> sybil<br /> Barnie<br /> Colin Royle<br /> <a href="http://www.mickandviv.com/pfm/pfm1diypages/212.htm" target="_blank">The Linn Isobarik DIY-Mods Bible</a><br /> <a href="http://www.hifiloudspeakers.info" target="_blank">hifiloudspeakers.info, formerly allansonline.com</a><br /> <a href="http://www.t-linespeakers.org/" target="_blank">Transmission Line Speakers</a><br /> <a href="http://www.falcon-acoustics.co.uk/hintstipsgeneral.htm" target="_blank">Falcon Acoustics Hints & Tips</a><br /> <a href="http://www.scan-speak.com/" target="_blank">Scan-Speak</a><br /> <a href="http://www.hiquphon.dk/" target="_blank">Hiquphon</a><br /> <a href="http://www.wilmslow-audio.co.uk/" target="_blank">Wilmslow Audio</a><br /> </p> <p>I believe the information provided here is correct. If you know otherwise, or have any further information, please PM me. </p> </font>
 
<font face="Verdana, Arial, Helvetica" size="2"> <p>The following table shows likely candidates for the original B139 fitted to the Isobarik based on age and specification. Each specification has been taken from a KEF document. Unfortunately, none of the documents are dated. The KEF specification (SP) number denotes a specific drawing, manufacture and test procedure. They are all the same; SP1044 in this case; hence the confusion. It looks like only real way to tell is for someone to weigh one. </p> <table bgcolor="#EEEEEE" cellspacing="0" border="1" width="100%"> <tr valign="top"> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> KEF B139 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> a) B139 SP1044 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> b) B139 SP1044 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> c) B139B SP1044 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> d) B139B SP1044 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> a.k.a. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> B139 Type II </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> B139 Type II </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Age </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> late 70's </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> mid 80's </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dimensions </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 11.82" x 8.25"<br /> 300mm x 210mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 300mm x 210mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 300mm x 210mm </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Weight </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 3.6kg/8lb </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 3.85kg/8.56lb </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 3.72kg </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Nominal Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Minimum Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 6.7Ω @ 160Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 50W in a 3 way reflex enclosure </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 100W </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 100W </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 100W </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Continuous </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20v rms 40W in a 3 way reflex enclosure </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20v rms 50W </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 28.7v rms 114W </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Frequency Response </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20-1000Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20-1000Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 25-500Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 23-500Hz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Voice Coil </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 5.08cm/2in </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 55mm/2in </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 52mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 55mm </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dividing Frequency </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 400Hz in a 3 way reflex enclosure </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Fundamental Resonance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 23Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 25Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 25Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Comments </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> I have included this one purely on the basis of age, in that it was around when Isobarik production started. However, programme power rating seems rather low so it may not have been used. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> I think this is the most likely driver used for the original Isobarik. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme and continuous ratings don't tie up on this specification. Linn may have changed to this driver or the one in column (d) for later model Isobariks, however I have seen no documentation to substatiate this. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Linn may have changed to this driver or the one in column (c) for later model Isobariks, however I have seen no documentation to substatiate this. </font> </td> </tr> </table> <p> The following table shows other B139 drivers I've found information on. These are not likely to have been used in production Isobariks as we know them today. </p> <p> I've been told the B139 6171 in column (e) was used in a first generation Isobarik between 1974 and 1977. They were styled differently to later models; about the size of an Isobarik swivelled on its base through 90°. They used two pairs of KEF T27 tweeters, but a very early variant with a plastic face plate and no visible wires on the front. The orientation of the midrange and treble units on the top was also reversed. I have not been able to find any other details about these but it would explain the revision history for September 1976 which states 'Current cabinet style adopted'. </p> <table bgcolor="#EEEEEE" cellspacing="0" border="1" width="100%"> <tr valign="top"> <td width="25%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> KEF B139 </font> </td> <td width="25%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> e) B139 6171 </font> </td> <td width="25%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> f) B139 SP1037 </font> </td> <td width="25%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> g) B139B SP1044 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> a.k.a. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Age </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> late 60's early 70's </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dimensions </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 13" x 9.5"<br /> 330 x 241mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 300 x 210mm </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Weight </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 4.5kg/10lb </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 3.85kg </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Nominal Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Minimum Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 50W in a 3 way reflex enclosure, 40W in a 2 way infinite baffle enclosure </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 100W </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Continuous </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 50W in a 3 way reflex enclosure, 40W in a 2 way infinite baffle enclosure </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Frequency Response </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20-1000Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20-1000Hz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Voice Coil </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 5.08cm/2in </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dividing Frequency </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 400Hz in a 3 way reflex enclosure, 1000Hz in a 2 way infinate baffle enclosure </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Fundamental Resonance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 28Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 25Hz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Comments </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> This B139 has a wider chassis than the others so would not fit into an Isobarik cabinet. However, see the note above regarding the first generation of Isobariks. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> I believe this had been wrongly documented because an SP1037 is also listed as a BD139 auxilliary bass radiator with a foam surround. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> I believe this unit is the same as that in column (b) above, although again, the model number and information presented here was taken from a KEF document. </font> </td> </tr> </table> <p></p> <table bgcolor="#EEEEEE" cellspacing="0" border="1" width="75%"> <tr valign="top"> <td width="25%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> KEF B139 </font> </td> <td width="25%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> h) B139 SP1333 </font> </td> <td width="25%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> i) B139 SP1212 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> a.k.a. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> TS1212 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Age </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> circa 1997 </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dimensions </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Weight </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Nominal Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 4Ω </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Minimum Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 125W </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Continuous </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Frequency Response </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Voice Coil </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dividing Frequency </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Fundamental Resonance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Comments </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> This is the specification number given to the B139 before production ceased. I am told it was specified by IMF for the TLS 80 and others and had the distinctive feature of three annular slots in the magnet to give a ventilated pole-piece. With the power handling increased from 100 to ~125 Watt, all other parameters such as voice coil size remained the same (but the same as which version, I know not). I have not been able to find any KEF specifications for it but one of the forum members has fitted 4 in a pair of Isobariks. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> I have not been able to find any KEF specifications for this but have been told it is the model used in the KEF C80. </font> </td> </tr> </table> </font>
 
<font face="Verdana, Arial, Helvetica" size="2"> <p>The following table shows likely candidates for the original B110 fitted to the Isobarik. The information shown is taken from KEF specifications. </p> <table bgcolor="#EEEEEE" cellspacing="0" border="1" width="80%"> <tr valign="top"> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> KEF B110 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> a) B110 SP1003 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> b) B110 SP1057 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> c) B110B SP1057 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> a.k.a. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Age </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dimensions </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 130mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 130mm </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 130mm </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Weight </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 1.13kg/2.5lb </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 1.13kg/2.5lb </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 1.13kg/2.5lb </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Nominal Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Minimum Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 7.8Ω @ 280Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 7.8Ω @ 280Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 7.8Ω @ 280Hz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 80W in a 3 way reflex enclosure, 30W in a 2 way infinite baffle enclosure </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 150W in a 3 way reflex enclosure, 50W in a 2 way infinite baffle enclosure </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 150W when used as a midrange unit, 50W when used as a bass/mid unit </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Continuous </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 15v rms 28W </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 28v rms 98W </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 28v rms 98W </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Frequency Response </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 55-3500Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 55-3500Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 55-3500Hz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Voice Coil </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 26mm/1in </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 26mm/1in </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 26mm/1in </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dividing Frequency </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Fundamental Resonance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 35Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 37Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 37Hz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Comments </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> I think this is the most likely driver used for the original Isobarik. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Linn may have changed to this driver for later model Isobariks, however I have seen no documentation to substatiate this. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> The KEF specification for this unit is identical to the B110 SP1057 in column (b). </font> </td> </tr> </table> <p>The following table shows other B110 drivers I've found information on. These are not likely to have been used in production Isobariks. </p> <table bgcolor="#EEEEEE" cellspacing="0" border="1" width="100%"> <tr valign="top"> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> KEF B110 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> d) B110 A6362 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> e) B110 SP1003 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> f) B110A SP1003 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> g) B110 SP1228 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> a.k.a. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Age </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 1970 </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dimensions </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 140mm/5.5in </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Weight </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 1.6kg/3.62lb </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Nominal Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 6Ω </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Minimum Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 50W in a 3 way reflex enclosure, 20W in a 2 way infinite baffle enclosure </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Continuous </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 30W in a 3 way reflex enclosure, 20W in a 2 way infinite baffle enclosure </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Frequency Response </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 55-3500Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Voice Coil </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 2.54cm/1in </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dividing Frequency </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 400 and 3500Hz in a 3 way reflex enclosure, 3500Hz in a 2 way infinate baffle enclosure </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Fundamental Resonance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 30Hz </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Comments </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> This was used in the original LS3/5. It is unlikely this was used in production Isobariks. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> This has a wider chassis than the others so would not fit into an Isobarik cabinet. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> This may be the same driver as the B110 SP1033 in either column (a) or (e). I have been unable to find any figures for it, only a reference to it. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> <p>This version of the B110 was designed with the assistance of the BBC specifically for the LS3/5a. The earlier SP1033 had variations in the consistency of the neoprene used in construction that the BBC were not happy with. </p> <p>As a 6Ω unit, it would not have been fitted into production Isobariks but it has been used as an effective replacement for blown drivers. </p> <p>If fitting these, official advise from KEF suggests listening to the 'speaker and if it sounds right, it probably is. There may be a slightly forward presentation of the midrange but it would really be system dependant. </p> <p>If you want to experiment they suggest either a good quality 2Ω resistor can be fitted in the positive line to the 'speaker or two 1Ω, one in the positive and one the negative line. </p> </font> </td> </tr> </table> </font>
 
<font face="Verdana, Arial, Helvetica" size="2"> <p>The following table shows details of tweeters likely to have been used in production Isobariks. </p> <table bgcolor="#EEEEEE" cellspacing="0" border="1" width="80%"> <tr valign="top"> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> Tweeters </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> a) Scan-Speak D2008 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> b) Scan-Speak D2008/8511 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> c) Linn D20-LP-1 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> a.k.a. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Hiquphon D20-LP-1 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Age </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> late 70's </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 80's? </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> mid 80's - still in production </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dimensions </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 92mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 92mm </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 92mm </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Weight </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Nominal Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Minimum Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Continuous </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Frequency Response </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Voice Coil </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dividing Frequency </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Fundamental Resonance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Comments </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> This would have been the driver originally fitted to production Isobariks. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> This one may or may not have been used in production prior to the change to the Hiquphon unit. I had a pair fitted to one of my Isobariks but I don't know if they were original. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> These are OEM drivers made for Linn by Hiquphon. I have been unable to find any documentation or specification for them and neither Linn nor Hiquphon are willing to provide it for this faq. They are available solely from Linn Products. Later versions have a Linn logo on the front face. </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Pictures </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> <ul type="square"> <li> <a href="http://www.mickandviv.com/pfm/ScanSpeakSideOld.jpg" target="_blank"> Older label </a> </li> </ul> </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> <ul type="square"> <li> <a href="http://www.mickandviv.com/pfm/ScanSpeakSideNewer.jpg" target="_blank"> Newer label </a> </li> </ul> </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> <ul type="square"> <li> <a href="http://www.mickandviv.com/pfm/Hiquphon-Logo.jpg" target="_blank"> Front - no logo </a> </li> <li> <a href="http://www.mickandviv.com/pfm/Hiquphon+Logo.jpg" target="_blank"> Front - with logo </a> </li> <li> <a href="http://www.mickandviv.com/pfm/HiquphonSide.jpg" target="_blank"> Side showing Linn label </a> </li> </ul> </font> </td> </tr> </table> <p>The following table shows details of tweeters unlikely to have been or definately not used in production Isobariks but which are suitable as replacements. </p> <table bgcolor="#EEEEEE" cellspacing="0" border="1" width="80%"> <tr valign="top"> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> Tweeters </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> d) Scan-Speak D2008/851200 </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> e) Linn Ninka Tweeter </font> </td> <td width="20%" bgcolor="#000000"> <font face="Verdana, Ariel, Helvetica" color="#ffffff" size="2"> f) Hiquphon OW1-92 </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> a.k.a. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> OW1 with 92mm faceplate </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Age </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Current </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Current </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Current </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dimensions </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 92mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 92mm </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Weight </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 0.4kg </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 0.36kg for 94mm faceplate model </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Nominal Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 8Ω </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Minimum Impedance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 6.7Ω </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Programme </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 150W (12dB/octave crossover at 4kHz) </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 100W (12db/octave crossover at 2.5kHz ) </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Continuous </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Frequency Response </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 4k-20kHz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 2kHz-28kHz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Voice Coil </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 19mm </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 20mm </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Dividing Frequency </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 4kHz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 2.5kHz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Fundamental Resonance </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 800Hz </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> 850Hz </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Comments </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Due to its more recent age, this driver would not have been used in production but it can be fitted today in place of older versions, something that has been done by a number of owners, myself included. They do not come in matched pairs but are generally sold from the same batch. I could find no details of changes to the specification over the years. The design of the front face has remained the same throughout the variations in model number. </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> The tweeter used in the Linn Ninka loudspeaker has been used as a replacement quite successfully. One Linn dealer has said it sounds quite good in the Isobarik and is a popular choice. </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Hiquphon will happily supply their OW1 tweeter with a special 92mm faceplate to fit the Isobarik and suggest it would make 'a very fine substitute'. They are supplied in matched pairs. </font> </td> </tr> <tr valign="top"> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> Pictures </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2"> <ul type="square"> <li> <a href="http://www.mickandviv.com/pfm/ScanSpeak.jpg" target="_blank"> D2008/851200 Front </a> </li> </ul> </font> </td> <td> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> <td bgcolor="#dfdfdf"> <font face="Verdana, Ariel, Helvetica" color="#000000" size="2">   </font> </td> </tr> </table> </font>
 


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