Billy, I do bi-amp my reQuests with the 7500. The bi-amping is a holdover from a previous amp, the Classe CAV-75, and not from any testing I've done with the 7500.

I did some blind listening tests with the CAV-75 (in various configurations) with a friend running the tests. Into each reQuest, I tried:
- 1 channel (75w)
- 2 channels (150w) bridged
- bi-wired (2x75w)
- passive bi-amp (2x75)

I don't recall all the results--it was about 5 or 6 years ago--but do recall that my musical preference was consistently (as I found out after the tests) the bi-amp configuration.

I speculate (no proof) I would not hear a difference between single-channel and bi-amping with the 7500. The 7500 is sooooo much more capable than the CAV-75.

I'd be interested in hearing what you think of the 7500 when you get yours.

Rob