i have the tantrum 1200.1 and they are very underrated. mine is 1422.8 watts rms. i haven't really ran that hard yet as my subs have not arrived yet but i did run some friends subs off of it and they sounded pretty loud and clean. check out this thread and read towards from like page 2 on. http://forums.caraudio.com/vb/showthread.php?t=50465 the ti is pretty comparable to the tantrum.
