Well I've just bought an optical cable to hook my CD player along its good ol' analog connection so that I'll compare the sound. My receiver is in a closet and I had a hard time to fit the cable to the receiver trying to locate the place of the input jack by the help of a mirror and a torchlight while the doggy was picking me at the back, man it was a tough work! Anyways, the receiver is a Denon 1802 and I guess the toslink input doesn't have a protective cap cause I couldn't feel anything to be removed and I forced the cable into the receiver missing the hole several times and I possibly scratched the tip if it gets scratched by the plactic frame on the receiver's input. I countless times touched the tip as well by the way. My question is; how sensitive are these optical cables? If I don't hear anthing wrong with the sound shall I assume the cable is OK to use or are there any risks using a damaged cable? Thanks for any input.