I'm running stacked, fully rebuilt Quads 57 and with my previous Audio Aero Prestige mono's (tubes), I had all the instruments so precise positioned on the rear wall and behind the speakers, that you could swear that there are multiple speakers on that real wall. Focus deep and sniper sharp!
My speakers were there only like a display and, for some reason, I always attributed that to 57's, because I never heard that anywhere else!
Heaven!!!
I got tired of tube hustles (specially 211's) and decided to switch to SS amps.
Since 57's are difficult to drive, one of the best options appear to be something from Pass Labs bigger amp(s), so I went with XA100.5.
Connecting the Pass amps, my real wall instruments completely disappeared, no focus, voice into my face, all the music coming from my speakers!
From heaven to hell!
The last 3-4 weeks I'm constantly moving the speakers around and I was able to get a better focus, more "homogenized" sound within the speakers and the middle (the focus), but not able to get the deepness and nothing from my rear wall! Rear wall instruments does not exist anymore, they are now coming from the speaker and that's annoying me very much!
Now no one's ask anymore where the sound is coming from......they all know! :)