Center speaker and AVR on same surface?

So to add to this, I use the isoacoustics stands, and have had the opportunity to do some measurements on my center channel speaker, so I’m not just talking randomly here.

While some issues about resonance are due to mechanical coupling, some are due to the boundary effect of any speaker on a shelf with kind of random dimensions.

Both are worth taking care of.

Also, depending on your needs, the IsoAcoustics pucks may be better.

It’s fine, the real issue is dealing with the bass and midrange resonances that the center will have on a shelf. If you can clean that up via manual DSP or decent speaker correction you’ll be fine. I've done this before.

Like all "bookshelf" speakers, center channels will avoid several problems on stands, but few of us have the floor space, myself included. This is why I’m using a DSP based amplifier for my new center channel project, so I can carefully tune the inevitable challenges.