Rockford Fosgate AudioPhile LP-1 Owner's Manual page 10

Once the jumpers are in place, mono filter input and output
then become either the left positive (+) and negative (-), or
right positive (+) and negative (-) inputs.
The table below lists the various crossover options available
with the LP-1 and LP-2 filters. The frequencies indicated here
reflect real measurements and not calculations based on
inductor values.
Model Number
LP-1 Stereo Mode
LP-1 Mono Mode
LP-2 Stereo Mode
LP-2 Mono Mode
Ω
2 Load
100 Hz
50 Hz
50 Hz
25 Hz
– 7 –
Ω
4 Load
200 Hz
100 Hz
100 Hz
50 Hz
Ω
8 Load
400 Hz
200 Hz
200 Hz
100 Hz