I have a set of these cables that I have used with a four amp system. When I first received them, the cables sounded really nice, but then I went and replaced the 14 gauge amp power cords with 10 gauge cords, which extended the bass, I lost the last bit in the highs--the speakers sounded muted. I replaced the cables going to the high frequency drivers with a lower 18 gauge generic cable, actually stripped some old audioquest cables down, pulled out two of the wires, made my own cables, and have my highs back again. I left the ant-cables going to the low freqency drivers alone and am very happy with the set up.