Subwoofer insight.

Hi @ghosthouse —
thanks for the specifics, and for the link — very informative!  I was wondering how to limit the low-end signal to my main speakers, and SVS has a good solution. Happy listening!

@cheeg 
You are very welcome. 
Apologies to the OP for digressing from his question but depending on how sophisticated you want to get, an external crossover might be something to consider.

In my experience and in my opinion....  

An 8 inch subwoofer in a 28' x 38' x 9' room?   I don't think so.  It's all about moving air. A single 8" driver can't move enough air.   2 x 8" drivers can't move enough air.  8 x 8" drivers can't move enough air.    

I use 2 x 18" subs in a room 14' x 26' x 8 1/2' and have them properly corner-loaded.  And I'm thinking of going to 4 x 18".   They are Eminence Kilomax Pro-18A drivers.  Bullet-proof.  

For your room, I would suggest 4 x 21" drivers and use them below 30hz.  If you want subs to go higher, then consider 8 x 15" (4 per side) using VERY STEEP low-pass filter at 45hz.  32hz / octave is the minimum low-pass slope, the steeper the better.   The object is to keep the anything over 60hz off the sub drivers.  It will cause transient time smear and other problems.  

I'm a REL S5 SHO owner. You can't go wrong with REL as long as you match correctly to your mains and room size. IMO the T series is a bit smallish for your room size. I think a stereo pair of the 812se is probably more what your room size needs. Call REL directly and they will help you match to the right sub in their lineup. 

GLHF!

I had a pair of T7i’s with my Dynaudioo Contour 60’s in a much smaller room. They really expanded the sound stage and the overall sound. Just upgraded to a pair of REL S510’s. Another big jump in SQ and now they really dig deep. I would recommend the 510’s or the 812’s for a room that big.