I agree with Gregm. There is passive, active, horizontal, and vertical biamping-- maybe more. I suggest the A'Gon search under bi-amping too. Good Luck. Craig
Please read the previous threads, Audiogon is a wealth of information. From the preamp output run a Y connector cable (several companies make them including monster or search Audiogon under Y cable, 2 are available) to each amplifier input. I prefer the Phoenix Gold solid adapter available from "Quest For Sound" on Audiogon. Good luck.
In addition to the threads here, I would recommend getting the free booklet "31 secrets to better sound" published by the great horn speaker maker - Avantguarde (see their website).
About 5 of the 31 "secrets" deal with biamping and I would concur with everything they say, except they claim biamping vertically gives you "five times the effective power". I still haven't figured that one out. How do they even get to four times the power?
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