The T-Amp should be plenty for that environment. You'll get plenty of gain just because your room is fairly small, so 89db could easily become 92db, unless you have a lot of carpeting and curtains and other stuff to dampen the sound. But room dampening is generally a good thing to prevent uneven frequency response as a result of sound reflecting in the room. I had a pair of speakers with 87db drivers and they got plenty loud in a room not much larger than yours. If you're concerned about bass response, consider replacing the big capacitor in the middle of the amp and replacing the volume control pot with an Alps 50k potentiometer so you can bypass the onboard input crap. A 2.2 or 3.3uf film cap and a 22k resistor in series for each input really fills out the bass. I beleive with a proper input, the frequency response is something ridiculous, like only -0.5db by the time it hits 0Hz. It makes you wonder why Sonic Impact butchered the inputs. Still, you can hit 40Hz well enough in stock form so I wouldn't worry about it too much.