Hello everyone. I have 2 questions about 2 pieces of gear.\n\n1. Why does the Onkyo TX-RZ820 only send a subwoofer signal out at higher volumes? At low volumes, you get no sub signal.\n\n2. Can the Yamaha A-S801 be used as a pre-amp? (Can you connect a power amplifier to it?)\n\nI await your reply. Kind regards.