I'm considering going with dual subs. I feel stupid for asking this question, but, my receiver (old Marantz SR5200) has one preamp sub output and one 7.1 direct SS sub output and I'm wondering what the connections would be for this setup? I'm assuming the subs would be daisy chained, but hate to assume stuff.\n\nAlso, I'm running a firestick on an epson movie projector, which basically has a 3.5mm jack for audio out options (GASP!), unless the USB port on it is an output, not even sure. What are my options for running the native 6.1 digital surround (or 7.1 direct surround? never used this option before) signal through the receiver, if any? Thank you in advance for your help.