This is all you need to know about speaker wire.
http://www.roger-russell.com/wire/wire.htm
http://www.roger-russell.com/wire/wire.htm#wiretable

If you need something in-wall, it must be Class 2 rated but prices usually aren't much different from typical copper wire cost, usually $1/ft or a bit less.
https://www.monoprice.com/product?p_id=2817

In your case given the short runs, 14 AWG would be fine even down to a 2ohm speaker load.

Last edited by chesseroo; 03/02/21 05:25 PM.
"Those who preach the myths of audio are ignorant of truth."