Different amp switches

[Robpevfai]

There is a switch on my precision power ppi 900.4 that is stereo or four channel. It seems as if my sub only plays while in stereo. Why is that?

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[CSCStang]

There is a switch on my precision power ppi 900.4 that is stereo or four channel. It seems as if my sub only plays while in stereo. Why is that?

Can't remember from the pic in the other thread, but do you have 2 sets of rca's running to that ppi?

 

[Robpevfai]

Yes I do.

 

[Robpevfai]