JL Audio RD500/1 Owner's Manual page 16

INSTALLATION NOTES:
Use this diagram to document your amplifier's switch and control positions.
16 | JL Audio - RD500/1 Owner's Manual
Monoblock Subwoofer Amplifier
+12 VDC Ground
Remote
CH. 1
( L )
( L )
CH. 2
( R )
( R )