Does the quality of speaker wire / cables really make a big difference?
It depends on whom you ask. Some people swear by certain brands of cable and other people say you can use old phone cord for speaker wire. Here’s our two cents: As far as speaker wire goes, a 12 gauge speaker wire will sound a heck of a lot better than 18 gauge wire. AV cable quality definitely matters. Most of the free cables that come with equipment are not very good. They will physically carry a signal, but will also carry interference, noise and other things you don’t want. Do yourself a favor and buy yourself good quality, properly shielded cables.