800 rms is pretty **** good for the T1 15. I have one on 1200 watts RMS on a Hifonics BXi1206D. Thats about the max I would push to it. It's taken it for almost 3 years now so the thing is definitely a champ. I wouldn't put it down cause its mainstream Rockford like some people would. I put up 143 dB @ 42hz in my accord with it, so not too disappointed. The 2 assassin 12's would have more cone area, and might be louder, but who knows. I guess I'm biased. hah