Hello funcshun,
Just an FYI: in domestic audio/video systems, canare connectors are mostly used for RF connections. I've never heard of a subwoofer-to-AV receiver connection using canare connectors. It doesn't mean you can't use one (you obviously have); it's just that all AV receivers and subwoofers normally use the RCA-style connector with shielded cable between the line-level sub output and the subwoofer line input.
In balanced systems, XLR cables are used between the preamp or AV receiver and the subwoofer.
All other comments about ground loops and eliminating the latter apply.
Regards,
Alan
