A few decades ago, just as fancy speaker wires were becoming the in thing, a story circulated of a speaker manufacturer who was using orange speaker cables. When asked what they were, because "they sound fantastic", they admitted that they had turned up to the show without any cables, so they nipped across the road to a B&Q (large DIY retailer for non-UK people) and bought a reel of two-way garden rated mains cable, the sort you would use to wire an electric mower.

More recently, I see people making great claims for special cables for digital interconnects. Now, in theory, you could argue that as the signal is digital, it has lots of high frequency content, so a cable with poor HF response would lose signal content, but, that misses the point. The transitions are at a high frequency, but they will still occur even if only the fundamental is retained. They might possibly be time-shifted, but they will still occur in the same place relative to each other. So unless the cable can't handle the fundamental, which is in the tens of kHz for digital audio and even the cheapest cables can transmit orders of magnitude above that, you won't notice.