By popular demand.

Any of you guys ought to hear the three- pairs- of —quad -57 system that is owned by a local friend. Dave Slagle of EMIA built the amplifiers that drive each speaker via a single interfacing transformer per speaker. So, he eliminated the quad audio step up transformers and all the associated electronics built into each speaker. It’s not quite direct drive but the sound is perhaps best I’ve ever heard. And that is a level of praise that I do that easily or happily confer on any system other than my own.

LOVE your Acoustat 2+2's!  I restored and updated my pair about two years ago.

They are ABSOLUTELY FABULOUS!!!

Great mofimadness! What are you doing for an interface now? Have you considered subs?

Lewm, how are they set up? Two each side and two in the center? Eliminating the electronics may upset the frequency response. How is he equalizing them? I did the same with the 2+2s. I eliminated the complex interface replacing it with one large transformer. It was favored to run up to 20 kHz at the expense of low bass. I always intended on running subs
subs so this did not matter to me. The big penalty was that the single transformer is a crazy load which few amps can handle. Even the JC1's were getting into trouble until I added a resistor in line with the primary. 
And, which of your systems gets the praise? 

Roger Modjeski designed a replacement for the Acoustat Medallion interface (which he characterized as having "serious problems" ;-) . He also offered a direct-drive OTL amp for Acoustats, as well as QUADS (the 57 for sure, the 63 I don't know).