This equalizer has made a dramatic improvement in the sound of the aftermarket receiver and amplifiers that I installed. It made connecting the receiver to the amplifiers and subwoofer a piece of cake. Unlike some other reviewers, I have not had any issues with it. I only have a couple of gripes, the fader control has a green light surrounding it that is WAY too bright and the graphic level display LEDs are also WAY too bright. I took care of both of these gripes with a few pieces of electrical tape.