I am putting in a Yamaha MusicCast-based system for the top floor of my house, covering three bedrooms. This will be driven by a Yamaha XA-QS5400RK amp, with two channels bridged to power the master bedroom speakers. The master bedroom will also have a small (SVS Micro 3000) subwoofer attached to a stereo pre-out from the Yamaha amp. I don't have the amp in-hand just yet, but from what I can tell it doesn't have the ability to apply a high-pass filter to the master bedroom speakers while maintaining a full-range preout output to the subwoofer (which has its own LPF). I want to just be able to cut off low frequencies to the in-wall speakers (Revel W893) and have the sub deal with those. Is there a product out there that would achieve this, ideally something I would just place in-line with the speaker cable outputs from the Yamaha amp?