I have a 600 in a room smaller than yours (12 X 16). It’s not TOO much. It’s just right. But if I were to do it again, I’d have two 500’s. The only reason for two 500’s over the single 600 is realestate. Sub placement is crucial and trying to find a spot in a small room for a sub that’s as big as the 600 is a downright pain in the ass. Placing twin 500’s is much simpler, and if you have two, much more forgiving. I would not go with one 500 though. The improvement in SQ that the 600 has over a 500 is significant (that’s coming from owning both, and not just an opinion based off charts). I’d say buy one 500 and see how it goes. You may not want two, probably not seeing how you won’t know what you’re missing.
