I have upgraded my system and am putting my 5 year old Definitive 10" sub in zone 2, about 75' from my receiver. I decided to run 12 gauge speaker wire to the sub since I had a 500' spool instead of purchasing a 75' sub cable.
I cut an old 10' Monster sub cable (since the people at 2 Radio Shacks were no help) and found:
2 primary conductors, roughly 20 gauge, one brown, one black.
One uninsulated silver wire wound with the two wires mentioned above.
All three of these wires were wrapped in foil.
Then, there's a braided copper wire mesh wrapped around the foil.
Lastly, there's 2 layers of rubber insulator.
I cut everything away and connected my 12 gauge speaker wire to the brown and black wires first mentioned on both ends (black to black and brown to red).
I DID NOT connect the uninsulated wire or the copper wire braid to anything else (although I was NOT careful to avoid a short between those two).
Finally, it's together! I've got signal, but when I shut down the receiver, the subwoofer continues to hum. I thought it was the air conditioner at first, but when I walked by the sub, I realize it was the sub. So, I am figuring the other 2 conductors do a job.
HELP! How should I connect the sub at both ends (receiver end and sub end) from 4 conductors in the old sub line to 2 conductor speaker wire to eliminate this hum? I have already run the speaker wire for zone 2 behind trim, so I am pretty much locked in...
Thanks for the help.