Professional Manufacturing---- The ground loop isolator adopts professional manufacturing process, with stable performance and good reliability. Please confirm whether the product is suitable before purchg. Noise Reduction---- The 4 channel ground loop noise isolator for car audio can reduce high pitched alternator noise caused by automotive electrical systems. Compact design, To Isolate and eliminate noise caused by a ground loop. Isolation Guarantee---- The RCA ground loop isolator can ensure that the shielding ground on each cable is isolated from any equipment ground. The ground loop isolator adopts professional manufacturing process, with stable performance and good reliability. Practical Accessory---- The ground loop filter noise isolator has a compact design and can be used to isolate and eliminate noise caused by grounding loop. Ideal and direct replacement for old or damaged ground loop isolator, dependable to use. 4 Channel Ground Loop Isolator---- High quality RCA cable, composed of two pairs of stereo (L, R) inputs and outputs. Each of the RCA plugs and jacks is gold plated for durable connection.