I'm trying to track down the source of occasional crackling noises, apparently in one channel only, and I think I've eliminated every possibility except the speaker cables. I've never been quite convinced that "special" cables are worth the money, but I'm getting desperate. The cable runs are quite long, and they pass close to a phone line and to some tubular light bulbs. I'm wondering whether noise could be caused by electrical interference, or maybe just by the length of the cables - and in either case, whether any particular kind of cable might help. Any suggestions gratefully accepted.