Many years ago I was worried about a pet chewing on my expensive cables in the living room stereo. Single ended RCAs from the preamp in the cabinet with sources to the amp sitting in between the speakers. So I put some of the foam tube water pipe insulation around them. I thought that there might be a very slight hit in additional capacitance but probably not noticeable or at least tolerable. Strangely enough the sound was slightly clearer. I chalked that up to microphonics on the single ended cables being reduced by the padding. Not as bad of microphonics as a high impedance guitar cable, but enough to affect the sound quality.