What makes you build a system around an amplifier?

There are a fair number of people who find the Atma-Sphere OTL's so much better than transformer-coupled amps (more transparent, better bass, more extended high end, "faster") that they are willing to find a speaker that will work well with them, in spite of the limitations OTL's impose. Maggie owners use the Anti Cable Autoformer to raise the impedance of their 4 ohm load to help match them with A-S amps . I complete understand and agree with that approach, at least in the case of Atma-Sphere.

@bdp24 thanks!

Generally speaking, the amp/speaker interface is a very important part of the game. OTLs in general like to see higher impedances (although the speaker impedance curve doesn’t have to be flat), and the same is often true of SETs.

First Watt solid state amps are also best used with speakers of more than 4 ohms. They don’t make a lot of power either, so you do best with them if you have an easier speaker to drive- 95 db or more.

I don’t agree that all ’well-designed’ amplifiers sound the same- far from it. A lot depends on the goal of the designer! For example, our amps are very wide bandwidth and low distortion, but they don’t use feedback, and that is with intention. This was to avoid the distortion caused by the feedback system itself, and the result of that was that we have to be quite selective about what speakers to use with the amps. But the upside is as far as we can tell, this allows us to get a lot closer to the music itself.

I’m pretty sure that if you talk to an SET designer, you will find that they say something quite similar, and if you read Nelson Pass’s articles about the First Watt amps, you will see the same thing espoused. I’m not saying that there is only one way and its our way, what I **am** saying is that making an amp that is a perfect voltage source is not the only way and that there are advantages to avoiding that approach.

This means that you can’t just buy a speaker and expect that any amp will work with it. In fact, the idea of the amp being a voltage source for flat bandwidth (which I call the Voltage Paradigm) really only works with box speakers where the impedance curve is also a map of the speaker’s efficiency. There are a number of speaker technologies that don’t fit that model and as a result, don’t work with that kind of amplification.

You can read more about this topic at this link:
http://www.atma-sphere.com/Resources/Paradigms_in_Amplifier_Design.php

@willemj , I agree with you in regard to the Quad ESL57.

Though some never find one, I think acquiring a transcendental product anchors one's system.  I've always thought the loudspeaker the most likely candidate.  But in the past generation, I find the number of unique and more interesting loudspeakers have declined to the degree that much more of a chance exists today for a power amplifier to serve that role.

I've owned quite a lot of amplifiers.  The Jadis DA60 comes closest to an amplifier I would build a system around.  Fortunately, it also mates beautifully with a wider range of loudspeakers than most.  Charles has long touted his 300B based amplifier becoming that for him, and found his happiness there, and many others have shared their stories.

But in the end, for me, it's the Quad ESL57 that so far outclasses any other component I've encountered, loudspeaker or amp, that it will serve as the foundation of my system for as long as I can see

I find the Music Reference idea ingenious! :) Why use a coupling cap and transformer, when driving an ESL with tubes? Drive them directly, and let the ESL become the coupling cap.

Hope someday I get to hear them.

Best,

E

I went to his website (music reference) and did not see these stats for sale ?