Coman61,
Many newer 7.1 AVRs offer the bi-amp mode using the surround L&R Rear amp channels to power either the top or bottom of a bi-ampable speaker. Since many people will only use 2, 2.1 or 5.1 speaker setups in their system, the unused surround rear channels can be configured to output an identical signal to the front main L&R channels and allow you to bi-amp the main speakers. It's a nice feature and it would seem to be very easy to implement. All AVR receiver manufacturers should offer it.....
Enjoy,
TIC
Many newer 7.1 AVRs offer the bi-amp mode using the surround L&R Rear amp channels to power either the top or bottom of a bi-ampable speaker. Since many people will only use 2, 2.1 or 5.1 speaker setups in their system, the unused surround rear channels can be configured to output an identical signal to the front main L&R channels and allow you to bi-amp the main speakers. It's a nice feature and it would seem to be very easy to implement. All AVR receiver manufacturers should offer it.....
Enjoy,
TIC