I have a 2000 Blazer-- "TrailBlazer" package. It has front 6.5" front door components, Tweeters in my dash and the rear door speakers all factory. NO subwoofer. It is however the bose package. Do I have an amp? if so where. Was looking to trash the blown components and just replace with 2 ways- regular speakers. Is this plug and play or will they not operate correctly? Do I have crossovers maybe?

 

Btw it only has ONE harness behind the headunit which is now an aftermarket sony.