My son-in-law has my old Yamaha RX-V1800 which is a 7.1 receiver so I purchased a splitter so he can connect two subs to the AVR. I'm guessing that I will lose some output signal strength due to the split so I will compensate with the volume dials on the subs. It will be an interesting exercise to see if I can integrate two subs, a PSB Subsonic 5 (10" dual ported) and an Energy XL-S8 (8" single ported) into a PSB Alpha system without a MiniDSP . I will be using REW to measure the response. The only tool I have for integration other than measuring the results is sub location.