Subwoofer recommendation

I am not an expert but am happy with the Rythmik sub.  I have a F12.  You could get a couple for $2500.

Jeez, how big is your room?  +1 @12many on the Rhythmiks.

It would make a lot of sense that you first determine how low your speakers go in your room. I would get an SPL meter and measure. When you find out what your cut off point is, then you can make a better decision as to what you need. I don't think you can do this by guessing. SPL meter will also help you integrate your sub much better than any ears could do. I hope this helps.

Used Paradigms

Vandersteen 2wq's are available for under $2K for a pair, but you need the crossovers ($800/pair). Just follow the directions and you'll have the best integrated subs you will ever know.-And, they will perform without issue for years.

Bob