Replaced my front speakers w/ these last year, just bought a second set for the rear. i have the front's on factory amp 50 watt rms, will be powering the rears w/ 90 watts rms. fronts still sound as good as the day i bought them, not sure if they will handle 90 watt's ,but that should be a safe limit for these speakers. was using polk audio but these sound as good or better than the polks, at a much better price. only thing i dont like is the small guage wire they send w/ speakers today (but they all do it). would recommend for factory replacements.