CPS Extended Service Plan (more info)
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to be honest... i run an amp that puts out 100w @ 4ohm to each speaker... alpine type s were garbage and clipped or w.e your wanna say. even with high pass filter set properly , bass turned down the alpine just sucked ... so i ordered a set of these. still same 100 w @ 4ohm and so much louder at same volume so much clearer no breakup at all in speakers no clipping ... these are much better then the alpines im sure people will disagree but to each there own and these were better for price