I believe the reason the Acoustat 2200 got mediocre reviews was a lack of amplifier power. I had original Quad ELS's for 15 years, and the Acoustat was the only speaker to make me want to switch. They had the same beautiful mid range, but much better highs, lows and imaging. But the Acoustats didn't really sing until I mated them with a Conrad Johnson Premier 1, which is capable of putting out over 250 watts into the very difficult Accoustat load.
Acoustat model 22/2200
Totally awesome in my 20x12 audio only room. Granted they dont play loud and need gobs of current/power. The Spectra Series gets it right. Too bad they had to close, from a few disgruntled reviewers, sales dropped because of it. The power of the Quill is deadly...One of only a slew to feel it! The panels damn near indestructable, not like the newer stats or panel speakers today. These are Classic"s