Research for subwoofer

Like others have suggested, that’s a large area to cover, two subs will probably work best. I use two subs in each listening room. One room is 13’x9’x8’. The other is a finished basement,which is an unusual shape,roughly 25’x15’ but not a rectangle.  I have SVS subs for music. I’ve had a good experience with the SVS app.  I’ve really never heard anything negative with REL for music. HSU research is another brand worth exploring.  As suggested above,Rythmik is also highly regarded. Enjoy the hunt! 

Love my RELs  Set and forget.  Don't need remote control once set.  I did need to move them around to reduce standing waves.

What kind of budget range are you looking at?

+1 REL but, specifically, REL T9/x given the size of your room.  Compared to its peers, REL sub has lower group delay and integrates better with the main.  I have tried SVS too.

Thanks for all the input Sounds like you have narrowed the field for me and given me great things to try.  I look forward to the experiments that are about to happen.

Budget I was looking at depended on what folks said.  From what I see I can do many of the suggestions for under 1400 and that would work well for me If I hear a real improvement.