Subwoofer for classical music listener


This is my second post on the subject of subwoofers.
My first post wasn't specific enough.
I listen to classical music 90% of the time.
Are there any classical music listeners out there who have subwoofers?
if there are, could you let me know what you have?
i don't imagine I would need quite as powerful or expensive a sub as those who mainly listen to other types of music, but I may be wrong.

rvpiano
Al:  Again thank you for your continuing help.
I could give you approximate room dimensions but I'll wait til I get a tape measure.

i have a question about phasing.
The SVS guy told me to set the phase to zero. How do I determine phasing differences?  What do I listen for? I really couldn't hear differences when I first set up the sub.
@rvpiano 
If you look at the manual page 7&9 it shows how to use the high pass filter. The manual should point out that you don’t use y adapters when using the high pass filter. You go from the preamp out to the sub in then from the sub out to the amp in . You will need two pairs of IC’s to do this. That manual should explain this!
https://system.na1.netsuite.com/core/media/media.nl?id=21137&c=3634088&h=34287ab58a6262c3686...