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.