gene said:
To say a receiver company is lying when delivering a product which usually has superior processing power, bass management, and features than dedicated separates processors costing 3X the amount - simply b/c they can't produce full power in the bogus "all channels driven" test (especially when they never claim they could) - is very silly at best IMO.
Gene - I'm not saying that spec'd multi channel power numbers are usually obtainable in most consumer conditions. But should it be allowed for someone to go into Best Buy, see a receiver quoted at doing 100Wx7 or whatever, and never being able to obtain it? I know I'd be pretty ticked off if I bought a new car and was never able to hit the gas mileage that was stated. I don't care if one spec or many specs are over-inflated... a lie is a lie is a lie. If the numbers say "A" watts x "B" channels, that receiver should be able to put out that amount of power given a stated set of conditions (1kHz sine wave, 1% THD+N pops up a decent amount of the time). Of all of the sub, mono, and 2 channel amps I've measured, there have been only a few times the "A" watts x "B" channels has not been met or nowhere near met. Maybe I need to broaden the companies I've looked at. There shouldn't be an excuse for multichannel amps.
As for sine waves driving channels, this is obviously the best way to strip away a numerous amount of variables when measuring power. As we've shown with our comments, unless there are explicit instructions about how to measure amplifiers, someone will go out there and bend the rules to inflate numbers and make their product look better.
My posts were not meant as a slam toward Yamaha. In fact, the reason for my original post was due to general personal interest in the receiver. My questions arose from research on several other receivers and seeing their negative sides.
I'm just trying to make my point for Joe Consumer. He should be told the reality of products even if some other wonderful features are in the product. Wonderful features in one area shouldn't allow for BS in other areas.