There's probably no reason whatsoever to run TWO cables to the JBL. It is possible that it doesn't even need to have both inputs. My SVS has both inputs, but I only need to use one of them.
I'd split the signal at the receiver with a Y.
Run one leg (mono) to each sub.
If your JBL for some reason doesn't like one input, Y it again back to two.
Thanks,
I like that idea, don't have to pull another 100' run.
Probably just move and add outlets and sub feed.
I HATE wires exposed, so everything gets fished thru the walls.
