Biamping crossover suggestion not diy in Technical/Modifications Posted April 2, 2012 An active setup that sounds better than what you probably have now is not going to be the cheapest thing you bought this month. Mark, I agree. One reads a lot about the benefit of an active crossover but the main question is whether one can hear the difference between the active and the passive crossover. To do that you need a better-than-average crossover. That was the reason for suggesting the Marchand XM9 as a middle-of-the-road crossover. I'm not sure that I would even try to bi-amp the center channel but if I were to, I would try a Rane AC22S ,or to tri-amp, an AC23. They allow separate gain control for LF/mids/highs and they can be easily bought and returned if one isn't satisfied with the sound. I used an AC-22 years ago with LWE speakers and thought it did a decent job with the equipment I had at the time (Kenwood 200wpc receiver on the woofer and Dyna ST-70 on the mid/highs). I still have it but don't want to ever alter the sound of the McIntosh 225 that I had rebuilt.