Good morning, I have an old Sansui 7001QRX that I have 4 Paradigm Titans hooked up to on the A speaker line. Can I put 2 passive Paradigm subwoofers in that line as well? If not can I split the speakers up between the A and B lines or do I need to have a seperate amp for the woofers. This is all new to me so any ideas would be helpful.