My room is 47 X 22 X 9 (Feet) - so it is a large space and yes I not only hear the bass- I feel it ( with movies).
Seaton subs are nice for the cost. They are made by Mark Seaton and its a small company. One 4000W powered sub can run 3 slaves. The only problem is getting them from Mark can take extra time as he is slow to deliver the product.
On another note-
Surround sound music sounds amazing with the Trinnov.
I always liked Trifield and DVD-A with the 861 but the Trinnov takes music to a whole new level (what the 861 should have become - or in a sense did).

My gear: Trinnov CI, 271, 8000.1(SEs), 7200.1 HC (SE), 320s, 3200s, Seaton F18 subs, MS200 (2nd zone), 218, 210.
Other: JVC RS-4100 projector, Lumagen Pro Radiance, Panamorph DCR anamorphic lens, Stewart G4 130 screen, Kaleidescape Strato K, Rvolution 4K player and Zapitti NAS, Oppo BDP-203,Roon Nucleus