herbu,
the Yamaha 779 has a virtual rear configuration where the 2 rear speakers are mounted to the front wall.
I was reading the manual and trying to decide if it was worth it as my listening area is about 12 feet from the front speakers but it is another 20 feet to the rear wall.
thanks
Mike,
Latent is on the right track. Many 7.1 AVRs have standard/fixed 5.1 outputs, and let you decide how you want to use the remaining 2 amps. You can choose Rear Surrounds, (which is traditional). Or you can choose Front Wides. Or you can choose Front Heights.
I think 20 feet to the rear wall is an advantage, not a disadvantage.
1) You can adjust the volume of each speaker individually to "balance" differences in distance. Yamaha's YPAO will do it automatically for you.
2) Rear Surrounds are for sound effects that are intended to come from behind you. A bigger distance helps them sound like they really are behind, not beside you.
3) Most movie soundtracks are in 5.1. Any other channels are artificially created within your AVR. But some movies are produced in 7.1. The sound engineers specifically put what they want in the Rear Surround channels. If you have configured your 2 amps for Front Heights or Wides, you will trade the intended rear effects for artificial front effects.
If it were me, I'd use the Rear Surrounds.