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New Yorks, Tannoy project

Discussion in 'classic' started by cooky1257, May 7, 2017.

  1. Elephantears

    Elephantears Trunkated Aesthete

    I'm intrigued by the hanging speakers at the NT; do you know what show were they used for?
     
  2. cooky1257

    cooky1257 pfm Member

    Not specifically, but these type of drivers have been used in Gerry Springer the musical, The Freddy Mercury stage show and numerous others here and in the US. The general application seems to be as natural acoustic reinforcement where say there's a live orchestra and/or choir.
     
  3. cooky1257

    cooky1257 pfm Member

    As I needed to retune these York(ish) enclosures to best suit the 3833/36 drivers I decided to measure them accurately, deducting port/driver/brace volumes. The 'empty' enclosure came in at 172L which drops to a surprising 156L after the above allowances and just 6L larger than the 15 DMT monitors. The 50hz port slot was equivalent to a 204mm dia circular port and so was easily modified retaining the existing height and depth by reducing the slot to 102mm to achieve a 29Hz tuning. They sound faster, cleaner and leaner now......[​IMG]
     
  4. cooky1257

    cooky1257 pfm Member

    Except.........I hadn't anticipated the effect of the proximity of the enclosure/damping sides on the port tuning given the position of this modified port-the end correction basically, the surprise was I figured the port was sufficiently clear of any internal surfaces, alas nope.
    Real world consequences are that 'effective' port lengths can be 50% longer.

    The impedance plot shows the bottom of the saddle is at 23hz rather than 29hz predicted by software. We can also see the second peak is higher than the first which indicates the port tuning is below driver Fs, the minor ripples would indicate some cabinet resonances-but I knew that already;-)

    [​IMG]

    The result is the bass is 1 to 2dB leaner than it need be.

    [​IMG]
     
  5. cooky1257

    cooky1257 pfm Member

    Bracing baffle area around the driver, the baffle is only 12mm ply so rather than just doubling the thickness I decided on some incremental changes. The rather odd free floating rectangular 50mm shelf rattled like a sod so I anchored it to the side panels with an L shape bracket brace. The midpoint at the side of the driver cut out also had a 50mm blocks either side added then I fitted some open triangular shaped braces to each corner around the driver holes. This seems to have removed a hollow "vvmmm" sound when you rap on the baffle. Upper bass is now noticeably cleaner.

    [​IMG]
     
  6. cooky1257

    cooky1257 pfm Member

    I'll be putting up 2 pairs of these refurbished drivers plus crossovers for sale soon, a very economical way to get the 15DMT2/Arden Legacy, Very good condition Arden 1's have to go too so watch this space.
     
  7. calorgas

    calorgas pfm Member

    Oooh, I'm picking up a pair of large empty cabinets this weekend (all things being equal) so would definitely be interested in some affordable 15" drivers to put inside them!
     
  8. cooky1257

    cooky1257 pfm Member

    Cool. How big are they?
     
  9. calorgas

    calorgas pfm Member

    They're Amesburys which are pretty much identical to Yorks I believe.
     
  10. cooky1257

    cooky1257 pfm Member

    Cool the port/slot doesn't seem as tall as the 50hz York.
    I've just modified these Yorks to have 1 port@ 29hz I was toying with 3 which would give flexibility as in the Ardens to have 1@29,2@38,all 3@49 hz tunings for room placement. They are sounding nice.
     
  11. calorgas

    calorgas pfm Member

    Holy crap, these Amesbury/York cabinets look absolutely bloody huge in my house! I knew how big the dims were but even so was slightly unprepared for their physical impact, ha ha. I think the effect is exaggerated as I have low ceilings but I keep having a double-take every time I look at them - my other half reckoned it felt like she'd been shrunk as the cabs look much like other vintage Tannoys I've had......just twice as big.

    Funny :D
     
  12. Tony L

    Tony L Administrator

    You get used to it, and after a while start to wonder where the hell you'd keep all the stuff you store on the tops if they weren't there...
     
  13. cooky1257

    cooky1257 pfm Member

    Yeah, and once pushed back against the wall you/she'll forget they are there.....
     
  14. cooky1257

    cooky1257 pfm Member

    Just measured the T&S of my newly acquired 3833 drivers;
    Averaged over the pair;

    Fs 31hz
    Re 5.45 ohms
    Qts 0.47
    VAS 326L
    BL 12.2

    This confirms they are effectively the same driver as the 3836.
     

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