JBL LSR4312SP Owner's Manual page 49

Appendix E: Wiring Requirements
While there are only HOT and GROUND/SHIELD connections from unbalanced sources, it is
recommended that high quality twisted pair cable be used. Diagram B shows an unbalanced source
connected to the balanced XLR input of the LSR subwoofer using twisted pair cable. Note that the shield
is connected to the GROUND/SHIELD connector at the LSR input, but not at the source. This reduces the
likelihood of introducing a ground loop into the system.
When using unbalanced signals with an LSR4312SP, we recommend using 1/4" Tip/Ring/Sleeve
connections. As shown in Diagram C, when using the 1/4" Tip/Ring/Sleeve or XLR connection,
the GROUND should be tied to the source -- not the sleeve -- of the subwoofer input for optimum
performance.
Diagram D details the connections using single conductor shielded cable with a Tip/Ring/Sleeve or XLR
plug for the LSR4312SP input. Single conductor cable should be used as a last resort as it provides the
greatest likelihood of problems. The "HOT" (+) signal should be connected to the tip of the Tip/Ring/
Sleeve plug. The GROUND should be attached to the Ring of the Tip/Ring/Sleeve plug at the LSR4312SP
input.
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