Back when you could buy them new I auditioned a pair of Acoustat 2 + 2, they required massive current. I got bigger amp: they drained the massive 75 pound Yamaha… 150wpc (?) I tried. Drained it dry at relative low volume. I had to return them. I bought the biggest newest Threshold s500 to power them… but it was so expensive I couldn’t afford to buy the Acoustat.

Perhaps, someone has more recent experience… but I would look at a Pass 350.

@ghdprentice

That is really interesting. As I mentioned above, the local Acoustat dealer (Early 1990s era) drove his speakers with the VAC REN 70/70. And believe me, that pairing absolutely sang beautifully. In addition he had a decent size listening space. Admittedly Kevin Hayes built those particular amplifiers with major quality output transformers and power supplies. That VAC model weigh nearly 100 pounds.

Charles

Charles

This is exactly what that Acoustat dealer had.

@charles1dad 

Great. I am just relating my experience. I run all tubes these days… left electrostatics and other planar in the past.

I had 2+2s for a couple years with the interfaces with Medallion transformers. Over time I acquired their servo amps, which sounded amazing, but in those days (1996) the amps were very unstable. There is a guy in Florida I think, who repairs/rebuilds them. Worth finding him

hth