he'd be better off using two of the wires in the extension cord seperate. The wires themselves are fine strands with is better for sound plus they're twisted all through the cord which will also help to cancel out any interferance that might be encountered. I used to build car stereo's in my younger days lol. The look on the rep from pioneers face when he asked how i got the sound dampened so well in my car and i showed him the duct insulation all through it was worth every penny spent
Yeah, he explained the twisting to me.... Also, Dynamatted every car I own, never used duct insulation, though....
If I could only remember to THINK about what I was doing before I did it.