2 Rel T7s or 1 Rel T9???

I'm replacing a pair of Rel T2s in my 2 channel system. Considering a pair of T7s or a single T9. Looking for opinions on running a larger single sub vs a smaller pair. My room is smallish, 12x19. For me, it's about the music not a floor shaking experience.

no doubt that REL makes the best sub in the marketplace!
I would try (1) sub, 1st and after several months of dedicated listening, make a decision about adding the 2nd sub.

Keep me posted & Happy Listening!
You will be better off with 2 smaller subs which will diminish low frequency room modes. For detailled explanations, read Floyd E. Toole 'Sound Reproduction'.
Also - read the latest article about subwoofers in the Absolute Sound magazine, this month's. Everything I've read points to the superiority of two subs. Two 7's should be
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