Originally Posted by lougilman
The question sounds pretty straightforward, I know you could say because they are. What I mean is HOW. I'm dealing with a situation where I'm considering using 16/2 as subwoofer cable, by soldering on RCA fittings and making my sub connection that way.
The first question is whether this is cable for the input to an active subwoofer, or cable for connecting a separate amplifier to a passive subwoofer. Sounds to me like this is the former, an input to an active subwoofer.
I've got a feeling that 16/2 might work, but it is inconsistent with accepted practice. Accepted practice would be to use shielded audio cable or shielded coax.
Generally speaking shielded coax is not terminated by soldering on connectors but rather special fittings called "Compression Fittings" are used. If you have to run it outside, not to worry because coax is rated for that, especially if you get special outdoors coax.
So here is your bill of materials:
Outdoor grade coax cable RG6 - only because that is most common and easiest to find. People on eBay will sell you it in whatever length you want
RCA compression fittings for RG6
Compression fitting stripping tool
Compression fitting crimping tool
Aside from running new cable (coax) outside the wall, this is really my only option, because the room is completely finished with high end carpentry and molding. I've seen more than a few discussions where people say the connection is possible, physically, but this doesn't clarify whether or not it's actually practical.
Outside is fine.
Most of the professionals I've spoken with, either at Polk Audio or one of our AV distributors, completely advised against it.
They probably advised coax like I am.
I know that coax runs at 75 ohms, but I'm not sure about speaker cable.
Not an issue.
A tech at Polk says that since speaker cable is suitable for high current signals, I would not want to use it for a line level connection.
Not an issue
Aside from the resistance of the coax, what else makes coax a better conductor for line level signals versus speaker cable?
(1) Coax is shielded, and the usual convention is to use shielded cable for line level signals.
(2) You can get easy-to-install connectors for coax that are very durable, even robust and also weather proof.
(3) You can get coax that is rated for running outdoors. UV will attack regular cable that is always outdoors and make it brittle over the years.