I own the newer T7. It doesn't go really deep, but does a very nice job of integrating with the main speakers. If you are looking for solid sub 25hz performance, you might need to go to one of their larger models.
The answer depends on the size of your room. Meiwan's answer is probably correct for the size of his room, BUT that doesn't mean to say that the T7 would not be appropriate for your room, where it may drop down well into the bottom end. I am utilizing a rel T5 ( smaller brother to the T7) which in my room (very small) can energize the room with no problem.
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