I want to set up an 8" Pioneer sub in my den basically for TV sound and sometimes music. The amp is an Audio Source 2 channel with no sub out. It does have A or B speaker outs, but only one can be used at a time. The sub has speaker inputs, but no speaker outs like you would see on the vast majority of subwoofers. The amp has L/R line outs, but the volume is fixed, so I don't want to use that. Any suggestions on how I can hook it up? The speakers are 5" Klipsch bookshelf speakers.