Monoprice currently has their 100 foot shielded RCA subwoofer cable for $.25 plus shipping (comes out to about $12 each). It’s made from RG6 cable so it’s not going to be very flexible, but you won’t see much (or any) signal loss. It’s also CL2 rated, which means you can safely run it inside walls.
If you buy four or more you can get the price down to below $5 each.
This isn’t good only for subwoofers; though. If you have your preamplifier at one end of the room, you can use these to put your power amp near your speakers at the other end, and then just run short wires from the amps to the speakers. Ignore that if you have no idea what I’m talking about.
https://www.monoprice.c
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