Phil: The best way to biamp is with an active cross-over and bi-pass the speaker's crossover. I have done this to great effect. I have Martin Logan's which benefit tremendously by separating the bass and panel demands on an amplifier. With the active cross-over, you don't have to worry about having only one pre-out. If you can't go with an active cross-over, your results will vary depending on the speakers. In most cases, it will improve things, but to a varying degree, and in some cases not worth the extra $$, which might be better spent on just upgrading the amplifier. Hard to tell which is best without knowing what speakers you are driving.
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