Originally Posted by Drumz
One issue though is still kindof bugging me. It is that issue of bi-amping. I got a call from C-fields this morning and the guy said that although he had never tried it, he asked me why I thought that the AVR's had that capability. He also said that maybe I could use the second zone to bi-amp the RTi A7's and that was something I had not considered but most folks on here say bi-amping is useless so why do the AVR's all have that ability? I believe you all know far more than the salespeople at C-field do as they are just parroting what the manufacturers are telling them in many cases although I am sure that there are people that are qualified over there that have their own home theater gear as well. I just need that whole issue to be completely settled in my brain before moving on.
: I didn't see anyone else address this, so I'll take a stab at it and one of the old-timers can correct me if I say anything too egregiously wrong...
All of the AVRs have the ability because even though it is useless, the manufacturers have to "keep up with the Joneses" and maintain feature parity within their price point. Bi-amping is just one more instance of the triumph of marketing nonsense over actual reality.
While bi-amping in theory
might have some positive effect on the sound, it's really only possible to get that if you are literally running the two halves of the speaker from separate dedicated amps or a dedicated amp that has separate power supplies/transformers for each channel. Bi-amping from an AVR is useless because just about all AVRs are running all of their channels from one power supply, so power going to any one channel takes away from power available to the other channels, which defeats the whole purpose of having increased power "headroom" available to the upper and lower halves of your speaker when bi-amping. Speaking more practically, for the ears that most of us have anyway, even if you were to bi-amp the real
way with dedicated amps with power to spare, the gains you may get don't really outweigh the expense you are now undertaking for extra amps.
Full disclosure: I've never used dedicated amps, and so do not have direct experience of any sound benefits to be gained from them, with or without bi-amping. Many folks on this forum use dedicated amps in their setups. I don't know who, if any, bi-amps with them.
More full disclosure: my RT800i fronts are bi-amped to my Yammie RX-A700 because at the time I built the system just about two years ago, 1) I knew I wasn't going to have rear surrounds for the foreseeable future and so would have 2 spare channels, and 2) I didn't know any better. Now it's just too much of a pain in the ass to pull everything out of the entertainment unit and undo it, so I leave it that way until I figure out how to put rear surrounds into my HT space.