BOSS Audio Systems Ground Loop Isolator B25N noise Filter for Car Audio Systems

BOSS Audio B25N Ground Loop Isolator Noise Filter, Reduces High Pitched Whine Alternator Noise caused by the car's electrical system, Always Use High Quality RCA Cables for your Audio System.Dimensions: 3.4 x 1.5 x 1.5, Unit Weight: .30 Lbs. Tips: Ground each amplifier independently. Same thing if you have added stiffening capacitors, go to a separate ground for the cap. Tips: Make sure that the amplifiers have a good ground first. Use at least 10 Gauge wires for the grounds (and power). If you have 2 or more amplifiers, DO NOT go from the ground terminal of one amp to the other and then from there to ground.