you mean the Telco's RCA, its teflon coated on the inner. seems to reduce something or resonnance.... but
it really tightens and strengthens the overall sound, (not so noisy)
if its the telcos, try the speaker plugs, if you have bi-wirable spk inputs, but using a pair of cable, plug two 2 at the other,
Guarantee.... you wouldnt want to take it out...