An owner’s Review... “Overall a good equalizer for any home stereo system but a must for vintage 80's Onkyo Systems to match their unique look. The sliders to adjust sound preferences are very finicky now approaching 30 years of age. The outer slider cover easily comes off exposing a very small clear plastic insert inside of the outer slider housing and together these fit over the green led indicator light on the end of the slider post. Very common to see either the outer slider knob, inner insert or green LED to be missing. Make sure they are all there and working as these parts are no longer available unless a donor unit can be found.”