Tight bass sub recommendations


What are the recommendations for a high quality subwoofer set- up. I have Maggie’s 1.7I speakers which I love but I think could use a little sub energy. Most of what I have tested seems a little boomy. I know there are 2 schools of thought 1 sub or 2 subs. I’m just looking for a deep Tight bass. Thoughts???
schmitty1
If the sub can't correct for the room then you will have plumpyier bass and it will not sound as if its coming from the main speakers.  Which should be the altimate goal.   
As for Rel good subs but not necessarily a sonic match to every speaker and room.  
+1 for Rythmik

Owned various REL, Velodyne, ML, Revel, SVS, Infinity, B&W, Wharfdale, Sunfire, plus others I don't care to remember...  an MBL too....   Only Wilson impress more but doesn't like that price tag.  I like JL too but matching it seamlessly is very hard.
I use a Klipsch sw308 sub with a pair of Kef ls50s. Great combo. I can highly recommend this sub for very articulate, tight extended bass. It uses two 8" passive radiators in conjunction with its 8" bass driver to do the deed very well indeed but in a more compact package than most.