ex brickie
pfm Member
I recall being in a dealer’s in Windsor (or Eton) and I recall them having an integrated amplifier (c£5k) by a brand called ‘Storm’ which had a dial where you could adjust the ohms
ATC's amplifiers are called "grounded source" so, yes I do assume they use Jim Strickland's 1984-patented "trans*nova topology" as did Hafler and Acoustat. I don't know about the MOSFETs (but I have found the ATC folks at shows to be free with information when asked so it could be confirmed I am sure).... IIRC (and I could be wrong) ATC use a Hafler like "swinging PSU, grounded output stage" topology and (more importantly) again IIRC they use old style lateral mosfets, which are the closest to an indestructible output device you can get. They like to run at least 100mA quiescent so do run warm yes. ...
ATC's amplifiers are called "grounded source" so, yes I do assume they use Jim Strickland's 1984-patented "trans*nova topology" as did Hafler and Acoustat. I don't know about the MOSFETs (but I have found the ATC folks at shows to be free with information when asked so it could be confirmed I am sure).
The design is used in studios world-wide so I assume it has to be robust. To me, substantial heatsinking is a key part of that. I posted an ATC photo link earlier and here's a link to @Jim Audiomisc's Armstrong 732 showing me that it too is likely to be robust. That's the sort of construction I would look for in a robust amplifier.
Good grief, I actually read all of that!>SNIP<
https://www.audiomisc.co.uk/Armstrong/reviews/finale/1982.html) didn't blow the (5 amp) power line fuses. Despite the reviewer in the HFN review cluelessly blowing one and not knowing that they'd done. Despite having the circuit diagram, etc. (sigh).
In reality, of course, most people will buy a powerful amp and use it happily at just a few watts per channel. 8-]
The load that a speaker imposes on an amp is a much more complicated question than most people realise. It’s not just sensitivity and impedance you need to consider; have you ever wondered what was being referred to when people talk about resistive loads, capacitive loads, inductive loads and phase angle? Check out this great article: https://www.stereophile.com/reference/707heavy/index.html
A 30W amp with an oversized linear power supply can be outstanding in fact.If the amplifier does not clip, there is no reason for a 300W to sound more effortless than a 30W.
Imagination is a wonderful thing
And with a sense of effortless/ no change in character.Pretty much any Hypex NCore or Purifi based Class D amps generally stable all the way to 2 ohms
The size of the power supply of most Class D amps should tell you a lot about their potential performance. Very good for high power portable PA equipment and such like.And with a sense of effortless/ no change in character.
Speakers in a realistic room don't follow the same distance law and will give higher SPL than in free space.At the listening position at three times the distance, that's a pretty average level
Better not tell @foxwelljsly that!85 dB average is already in hearing damage territory
Pardon?Better not tell @foxwelljsly that!
Well, 30W into 90dB/W/m maxes out at around 105dB/m peak. Allowing for 20dB peaks, that's an average of 85dB at one metre. At the listening position at three times the distance, that's a pretty average level. 120W is more accommodating with additional 6dB headroom.