well, yeah!
the Acoustat's (well set-up) projected a beautiful image at the sweet spot only, with wonderful detail and not so wonderful dynamics. the latter was definitely helped by high-pass filtering (passively) the panels and adding a subwoofer, but it remained the speakers' main drawback.
I owned Acoustat Spectra 33's for ten years. Those speakers drove me crazy!!
They had so much potential, BUT, they turned out to be just to damn hard to get them to sound right throughout all the musical registers. There was always a frequency spectrum that was either too pronnounced or thin/threadbare.
The Spectras revealed EVERYTHING, and then some. Any flaws in the electronics, and man, they showed up in spades. The only amps that seem to work well with them were either Thresholds or high powered tube amps.
I finally sold them, and while I occasionaly miss some of what they could do, I do not miss all the issues to get them set up and working well.