I have 2 xti amps....a 2000 and 4000....I run Peavey Sp2 15's and the Sp2 18's.....the speakers are rated for up to 2000 and 4000 watts so in theory its a perfect match for the amps....I have noticed that my amps will clip.....they will go from Signal to - 20, and then just clip. They do it -10 then clip...but more often the - 20 then clip. Does anyone know what the problem could be? I have consided about selling the speakers because I think they just can't handle the power. I have a set of non powered JBL Eon 1500 as well and they do not clip with them or my yamaha speakers.