TCS wrote:

There's in fact a very strong inverse correlation between how much you
spend and the quality of cable. It isn't making cables so incredibly
mediocre that they have trouble passing high audio frequencies without
muffling them ( ie: sound warm).

That's due to too small a gauge. 12-14 gauge common electrical wiring
is more than any 6-8 ohm speaker needs to have this reduiced below
audible levels.