Isolate and eliminate noise caused by a ground loop in an audio circuit with this Four-Channel Ground Loop Isolator. The isolator ensures that the shield ground on each audio cable is isolated from any equipment ground; which could cause audible noise when amplified. This device has four channels; composed of two pairs of stereo (L+R) inputs and outputs. The nominal DC impedance of the device is 100 ohms and the audio impedance is 3500 ohms at 1000 Hz. The nominal input power is 50 watts; with a maximum power level of 100 watts. Each of the RCA plugs and jacks is gold-plated to ensure smooth; corrosion-free connections. The unit measures 3.9" x 2.0" x 0.9" (100 x 50 x 22 mm) and both the input and output leads measure 9" in length. Note: The packaging erroneously indicates that the isolator s case is made of metal. It is in fact made of plastic. We are working to correct this discrepancy and apologize for any confusion or inconvenience it may cause.