I think the AV comcast box or the channel's source is poor / slightly out of phase or focus and the KLEI Copper Harmony RCAs just exaggerate that...I would say, not exaggerate but allow more of the AV comcast box or the channels poor/slightly out of phase or focus signal through.
I have not noticed that the Copper Harmony plugs to exaggerate but they do allow of the signal through... that is, more micro harmonics, stage, PRAT, timbre, decay, etc :)
I wonder if a better AC chord will help... highly likely! Do Douglas Connection do power chords? Actually, what has Douglas Connection suggested :)