I just purchased a used DD12 sub for $1100 to compliment my Adam A7's in my 13x12x8 room. I've heard some good things about it, and it seemed like a bargain price (we'll see when it arrives!), but just wanted to see if you guys have anything to add. Some precautions, some setup advice, etc. I have never used a sub, but my adams are rolling of -3dB at 80Hz, so I felt I needed a sub for those freq. I know the specs say the Adam's -3dB point is 48Hz but that's not what's happening. Maybe I have too many bass traps in my room??? Anyway, I guess that turned into a couple different questions, but that's my ADD for ya!