In the search for SQ improvement from the room, I tried removing the rack and put the components on the floor (separated by the same wood and isolation devices used with the rack) and things improved, big enough I never even tried a reverse trial and moved the rack out of the room same day. By things I mean less high level glare (my room/system's weak spot to my eras) and better soundstage. The rack was about halfway between speakers and front wall. My room is not ideal, 11.5 x 20.5, a bit of a tunnel, so YMMV. This was before I added absorption at primary reflection points, so if I get bored one day maybe I'll pull the rack back in the room? Next I will experiment with mix of diffusers and absorption on the front wall, which has a heavily curtained window. The windows also have blinds, and sometimes I can convince myself I like the sound more when the curtains are open and blinds are reflecting, sometimes not.
Full disclosure, the rack was a cheap Ikea table, veneer over foam, so hard to say if I improved reflections or isolation/vibration or both.
Full disclosure, the rack was a cheap Ikea table, veneer over foam, so hard to say if I improved reflections or isolation/vibration or both.