which subwoofer?

I am looking for a musical sub for a small room(11.5x15x8), my speakers are Meadowlark kestral 2's, a Birdland odeon lite dac and a Cayin ta-3o integrated tube amp. For the price of all of it used, this system is incredibly musical and rich in the high's and mids...but lacks that bit of deep punch I like. Is there a sub made that will integrate with my existing equipment without losing anything. I would like to keep the price under a 1000$ used, thanks in advance!