Hi J.B. and all,

Speaker cable isn't shielded at all; it carries a high-level signal. Low-level (line-out)LFE sub-cable signals must use shielded coaxial cable to avoid pick-up of AC hum and external interference.

Ford Prefect: If the line-out signal from one sub to your second sub works well, why not use it? No point in obsessing over why your Y-adapter arrangement isn't working.

Regards,
Alan

Alan Lofft,
Axiom Resident Expert (Retired)