tdbc3r

All, there are so many LOC posts that I cannot find what I am looking for. Sorry about that. Question looking to just a add 1 sub to a factory system. Can I hook up my LOC to just one rear speaker and combine L/R channels on the LOC. Would be easier than going to both sets of rears as they are in the doors and not the trunk/hatch. I do not really want to pull the radio and risk tapping in behind it. Thoughts?