Originally posted by Altec:
It's impossible from a manufacturing and marketing standpoint to produce an amplifier such as you suggest. It would limit the setup options far too much to make it economically viable. So, what is the status quo is likely to remain.
This isn't actually true. It's the case for traditional tube and class D amplifiers, but companies are making multi-channel amps with different output wattage for the side and rear channels.
You can find an example at
http://www.wyred4sound.com or at
http://www.d-sonic.net However, I can't seem to grasp how these systems scale linearly when the volume is turned up since they'll be outputting different wattage. Unfortunately I don't have a good enough understanding of electronics to understand this concept even though several people tied to explain it to me on AVS.