Equipment rack behind speakers: bad?

Done it many times (see my system). Best if the rack is centered behind/between the speakers since bass tends to build up in the corners, not the middle. And anyway, at the boundries (like the back wall) the energy transfers to the wall itself (which is turning the wave around) but there's actually less air movement to affect your equipment rack. In the picture of my system, you'll note I even have a Target TT shelf bolted to the back wall (OK, it's a brick wall) but the TT had absolutely no vibes transmitted to it.

The only downside -- it's a bit further to walk, so get a remote volume preamp :~))

As long as your rack is open? I see no problem at all. If your rack is closed on both sides this could affect your soundstage.

Thanks for your responses. I'm mainly concerned with acoustical not vibration problems, as the floor is cement with carpet over it. I also have an isolation platform for my turntable ... I want as nice a soundstage as possible, but my room is too narrow (about 12 - 13') to put the rack to the side of the speakers (unless it's in the corner behind the speakers, which for the reasons you all note above, I didn't want to do). The room has 8' ceilings and is about 25 - 27' long. Not perfect, but not bad either. Thanks again and good tidings to all!

Fairley, I also have a narrow 12' room. But even if it were wider, I think the best solution, both in terms of user convenience and system (electronic) layout, would be to put the amp(s), subs, elec. x-overs, etc, between the speakers and all the other front end stuff to the left or right sidewall, even with the listening position. You will use long ICs from preamp to amp(s) and short speaker cables -- which is the preferred way to do it IMO.