Sure, BUT, don’t just connect it to the cold water supply - they need proper isolation - I’ve heard of cases where households have gotten really sick and they found that bacteria from the bum gun had made it back to the drinking water.

I don’t usually take scissors to the bar with me

(speaker calbles almost warrant a debate due to the currents and the reactive load, but the smartest people I knew in the field would just use domestic mains cable for this as it ticked all the boxes that mattered at a low price. They’d literally connect £10k speakers.up with it!)

I suspect you haven’t missed anything and the audio tracks provided have been either inadvertently or deliberately manipulated by some other factor unrelated to the RCA cables.

For context, I’m an Elecronics Engineer with a Masters Degree and 17 years industry experience in a mix of RF and Pro Audio product design, including designing high spec audio converters for both studio and test and measurement use.

Apart from something extraordinarily badly designed, broken or dirty, there is no plausible reason why a cable carrying a signal with no significant current and no high frequency components can have any effect on that signal - high frequency audio is approximately DC in the wider scope of Electronics Engineering.

That answer doesn’t suite people trying to get rich selling ridiculous cables though.