According to w_tom :
The issue is safety. Power wires should always remain at
least a few inches separated from low voltages. This for both
human safety and for transistor safety.

Treat AV wiring as class II low voltage wiring: As much as
possible, it should be kept at least 12" away from power,
and cross only at right angles.

In the meantime, buying any products from Monster Cables
suggests you also want to buy a Brooklyn Bridge.

It seems particularly silly to buy stupidly expensive Monster
Cables to reduce noise, and, yet, put it right next to noise
sources - that will induce orders of magnitude more noise (not
that it's that much with speakers) than the Monster Cable
could feasibly eliminate.

If you're going to spend the money on Monster Cable myth,
you might as well go all the way.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.