Russ, Most subs will have the L+R rca input and one of those might say mono. Think home theater where the processor has only one sub out. I run 2 subs with 2 channel and I hook the L pre out to the L sub in and the R pre out to the L pre in to the other. It's still the right channel but I use the L because the gain of my sub is different if I just use the L/mono input. Different subs may vary, just make sure you read the owners manual or ask the manufacturer. Good luck.
How do I hook up a subwoofer for 2-channel
I want to use 2-subs in a 2-channel system.I am going to use either Rel or Martin Logan. Which ever one I decide to go with How do you connect the wiring so that one sub controls the right channel and the other the left? I want to use these subs with a Martin Logan speaker.