as long as you get rid of the distorton or clippin from the speaker youll be fine, plenty of people on here over power speakers all the time, theres people that double, or even triple the rated power to their component sets, this however doesnt apply for all speakers, if you know what you are doin you can get well over rate on almost any speaker, but for daily use 100rms over on those subs shouldnt be a problem, just set gains properly.