Originally Posted by rchiggins420
Perhaps I have it all wrong...but..
If my receiver has a power rating of lets say 100wpc and I connect 1 channel to a 3 way speaker...is the signal not being split 3 ways?..in other words, 100 watts being shared by the bass, mid and tweeter. Now if I hook the speaker up to 2 channels,ch1 powers the bass and ch6 powers the mid/tweet , shouldn't the bass have 100w all to itself and 100w split between mid/hi for a total of 200w?
Please correct me if im wrong!
If you actually double the power, the resulting loudness gain is 3 dB. One notch louder to most folks.
BUT, you are playing back real content, not white noise. And real content has at most 25% of total power going to the tweeter. Assuming (as is usually the case) the split is from tweeter to mid/woofer, the most additional output you could possibly gain with real world material is 25% more power. About one dB. Barely noticeable under most conditions.
More importantly, if you are not achieveing audible distortion without biamping, then biamping cannot do anything to improve the sound (although it might change it if the amps used have different input sensitivities). Clean power is clean power. A 100 watt amp doesn't always put out 100 watts. If additional power means you can get louder, that HAS TO MEAN that quieter uses less power. With reasonably normal speakers in a typical room, listening pretty loud (say 85 dB average) uses a whopping 2 watts or so. Your speakers' drivers just cannot feel, see, taste or smell the unused power that may or may not be present in the connected amps.
Nick from Anthem proposed the only potentially reasonable basis for biamping to make a significant difference that I've seen. Assume that without biamping you have audible distortion. Harmonic distortion is, by definition and in reality, creation by the amplifier (or speaker) of additional harmonic content above the frequency of a given fundamental. If you biamp, the amp driving the tweeter won't be distorting, because it's running at a quarter or less of the power being delivered to the woofers. While the amp on the lows almost certainly continues to distort, the highest frequency distortion products, which would go go the tweeter, don't make iit there, and you may have a less unpleasant distortion profile. That's as good as it gets, AFAIK