Can foam insulation jackets wrapped on cables harm

you should keep an eye on your cables for discolorations as you could have a chemical reaction between the materials. some foams tend to release gases long after they have been manufactured. other wise more insulation won't hurt

May I mention that HMS cables is taking great care in engineering the skins of their cables. No static energy from the "outside" will ever penetrate their interconnects or speaker cables and thus degrade the sound.

Christian Brouwer
proud importer of
HMS cables
extreme audiophile cables
for down-to-earth prices

I have done this for a long time with no loss of sound quality whatsoever.