I bought this equalizer for my stereo (Sony floor speakers for the front channels and Sony bookshelf's for the rear, Sony stereo receiver) and it works great. It really improves the sound of my stereo (and any stereo, of course). The circuitry is very good, there is no noticeable decrease in sound quality. There are a few problems with the unit, however. My standard-sized receiver previously sat on top of a standard-sized Pioneer CD player, and I put the equalizer in between. Unfortunately, the EQ is almost 4" shorter (by shorter, I mean depth) than the receiver and CD player. The EQ is just big enough to hold the receiver; the rear legs of the receiver are right on the edge. Other annoyances include the LED's in the sliders, which are cool, but are set to move through the sliders, or to stay on (very bright), but not off, and the plug is three-pronged rather than two-pronged, so it won't plug into the AC power on the back of a receiver. Still a great EQ though, I would recommend it if you want a better sounding stereo.