Additional subs will excite modes and contribute to a fuller sound and flatter response. A left and right signal will further benefit sound quality and lushness in these respects and in higher frequency bands depending on layout and recording.
I dont see high level speaker inputs on the back of that fathem. If it lacks them you can get speaker line to RCA adapters and wire a left and right. I have done that before. Although Im not familiar with that particular amp so you might want to double check specifically. Some amplifiers need to be grounded. Its safe with some while with some others its not. I recall encountering the hazard note that applied to hooking a sub to a particular tube amplifier while using speaker line outs. Although it might not apply with the adapter connection aforementioned. A neutrik was being utilized in the other situation.
I dont see high level speaker inputs on the back of that fathem. If it lacks them you can get speaker line to RCA adapters and wire a left and right. I have done that before. Although Im not familiar with that particular amp so you might want to double check specifically. Some amplifiers need to be grounded. Its safe with some while with some others its not. I recall encountering the hazard note that applied to hooking a sub to a particular tube amplifier while using speaker line outs. Although it might not apply with the adapter connection aforementioned. A neutrik was being utilized in the other situation.