Fifty years ago I heard a tri-amped set of Magneplanar Tympani IIIas with bass panels spread across a large basement rec room. They were powered by 3 - Audio Research Dual 76 amps, and an SP-3a preamp. The front end was a Thorens TD-125 with an SME arm and a Koetsu MC cart. We listened to Joni Mitchell's 'Miles of Aisles' live album, Dan Hicks 'Live at the Troubadour' as well several other cuts from that era. It was by far the biggest soundstage I have ever heard, it was dynamic, detailed, and unfatiguing, and I was very sorry when the night was over.
I have heard (and owned) many great systems since, but none have ever come close to that experience.