I'm looking for gizmo that I don't know exists or not. I would like the ability to manipulate bass / treble to my speakers. I'm running M80's through my receiver's second zone, which passes straight stereo without the ability to manipulate the sygnol. Some of my CD's just have too much treble, and I'd like to tone those down a tad. So what I'm looking for is a gizmo that I can place between the AVR and the speakers. Any idea's?