Originally Posted by Sven26
but that wouldn't separate the high and low frequencies...I thought the benefit of bi amping was driving a narrower frequency range.
As others have pointed out, passive biamping does not fully separate the high and low frequencies. Both sets of amplifiers amplify the same signals.
Separating the amplification of high and low frequencies would only have an audible advantage if the amplifier had audible intermodulation distortion. Good modern audio gear doesn't have this problem.
Your education about the benefits of biamping seems to be simplistic. The major benefit of biamplification is the use of active crossovers and the elimination of passive crossovers. Active crossovers can be more fully optimized to maximize system performance. The separation of signals into narrower frequency ranges is a secondary effect, not the major goal.
Many home audio systems do use active biamplification, and the benefits that we see in those applications are very instructive. The most common application of biamping in modern home audio systems is the use of powered subwoofers.
When we use powered subwoofers:
(1) We use active crossovers that route high and low frequencies through different amplifiers with different power ratings that are tailored to the needs of different speakers and installations.
(2) Our powered subwoofers use amplifiers that are themselves tailored by professional engineers to meet the needs of the exact speaker driver that they are used with.
(3) The use of active crossovers enables easy selection of crossover frequencies to meet the varying needs of different installations.
(4) Because our active crossovers split the frequencies up, they can make more efficient use of available amplifier power, since the power amps don't have to amplify signals that the speaker they drive aren't handling.
As you can see, this is so different from passive biamplification that there is simply no comparison.