You need to have a good system ...
i.e. high resolution separates, to hear the differences among cables, whether they're interconnect, speaker or power cables IME. In my current 2-ch system, comprising of Magnepan 3.6 speakers, Odyssey Stratos Extreme monoblocks, Monarchy Audio NM24 pre-amp and Sony NS999ES CDP, I can clearly distinguish the differences in cables, particularly between copper and silver, some are subtle, most are significant. There are quite a few posters who claim "cables are cables" but my actual experience and others have proven otherwise. In contrast, I don't hear any differences among cables via my $400 Yamaha receiver in my HT set up. We all want to get the most performance that our hard earned electronics, particularly high priced ones, are capable of and I believe it's one's loss to not try to extract that performance out because of the "cables are cables" bias. I do agree, however, that, again from experience, some inexpensive cables are capable to produce tremendous musicality.