"The setup is in the living room, with three walls, and the fourth side open to the dining room. The living room itself would have been 18' L X 12' W X 18' H = 3888 cu. ft, but the fact that it opens up to the dining room makes the entire space more like 40' L X 18' W X 12' = 8540 cu. ft. Would I benefit from a subwoofer and which one should I get?"
I would first get a more powerful amp for your main speakers given the size of your room. You're NAD is good in that it jumps the amp and preamp section externally using rca jacks. It can be used just as a preamp. For subs, I would consider getting 2 small powered subs that are designed for music and not HT.
I would first get a more powerful amp for your main speakers given the size of your room. You're NAD is good in that it jumps the amp and preamp section externally using rca jacks. It can be used just as a preamp. For subs, I would consider getting 2 small powered subs that are designed for music and not HT.