Cadence Momentum CSA SERIES Owner's Manual page 16

2 CHANNEL AMPLIFIER 4 OHM BRIDGED (CSA 1000.2, CSA 2000.2)
For this configuration place crossover mode switch in low pass position.
15
SUBWOOFER
MINIMUM IMPEDANCE
4 OHMS
FUSE
CH2 CH1
2 OHM STEREO
4 OHM MONO BRIDGED
+12V REM GND