Awesome loud.Running the pair on a 4channel taramps 400watt bridged.Amp needed ground loop filter but these speakers pound.I hope they don't blow but so far so good.They say 125rms there getting 200Rms and they take it no problems.I have the 6.5" in boxs as corner kickers in my truck.There loud enough to keep up with 2 Alpine 12" at 1000watt rms.Gotta do the big three upgrade now afraid I'm in need of more power...