I have heard the Perspectives at a dealer’s showroom. We initially came for a friend to listen to another pair of speakers and the dealer had us sit and listen to the JA driven by a huge The Gryphon integrated.
Well, I was shocked: easily one of the best sound I’ve heard, and definitely the deepest soundstage EVER (there was a battery solo in the recording, and the battery was like 8 feet behind the speakers, crazy) BUT in that large-ish showroom at what I call moderate levels (comfortable, but less loud that many big systems at audio shows) I could hear the woofers bottoming out on some impulses. That didn’t seem to bother the dealer. I guess the room was a bit too big.