Pro Audio Support

Q:
I have a subwoofer and want to use it with my stereo speakers. How can I configure the Monitor Station for this?
 
A:
There are three speaker modes on the Presonus Monitor Station. In "Toggle A/B" mode, Speaker C is always on so you can connect your Sub to that output. Then you can toggle between Speaker A and B (only one will be on at a time) if you have two pairs of stereo speakers.

Manual reference, page 12.