Subwoofer for classical music listener

Thank you, guys, for your insights! I shall invite my local dealer for a listen (the perk of living in Malibu is that folks do not mind the drive!). 
My sub is tuned up onto the "invisible" level so that my primary listening to Richter and Schubert quartets wont get muddied. SBLs are pretty fast (someone called them Ferraris of loudspeakers?) but when it comes to pipe organ, they fold!!! 
Looking for a new house with a dedicated den, and an old bachelor uncle! ;-(

Btw, I was in error. The SVS SB-2000 is NOT ported?
The  SP-2000 is ported.

Yogiboy, thanks for pointing it out and thank you for the encouragement too!

I'm glad your encouraged  I just want you to realize 
when you hook up
your amps low input imp and the subs in RCA parallel  w your tube Pre amp it will see a very low imp load 
 Lifeless may be the result
best JohnnyR