I think im gonna pass on this idea. I think i might have confused some here, I am not using a preamp or a power amp. I am using a 6.1 surround reciever. and trying to biamp it with a jvc prologic reciever. I dont think i will really benifit from this as it seem as though there are too many issues to contend with "highpass filter/attenuator" neither of which i have. I just wanted to use an old amp that is collecting dust.
+t to all
Surely your surround receiver contains internally both a preamp/volume control and a slew of power amps.
The question is can you gain access to the main stereo pair of signals BEFORE they head to the internal power amp stage?
Possibly on the rear of the unit, among a forest of in and outs, there is a pair of RCAs called ("main stereo") pre-out (and power in).
If these are not present you could mod the unit by adding a pair of wires from the input of the stereo amp stage and
to a pair of RCAs on the rear.
What do you stand to gain from bi-amping?
You get a dedicated amplifier handling the lower frequencies and an equally dedicated amplifier handling the highs.
For those worried about amplifier class & idle current, cross-over distortion, inter-modular distortion etc etc
the benefits are numerous. However, if you think you can play much louder when biamping you are on the wrong track.
Having dedicated amplifiers for each speaker element means you potentially can simplify the speaker's crossover as well.
That is, move the crossover functionality from the speaker encloure and into or ahead of the amplifier. In this manner
each amplifer is asked to do even less work and will, as a result, produce even less distortion etc.
But, to reap these benefits your prologic receiver must in some way be audibly "better" than the surround sound receiver.
Jon