car stereo no amp how much rms?

Hitta f. Mac

New member
ok so i used to have a buick lesabre and the sound system was good i didnt need an amp just door and back 6x9 speakers it sounded pretty loud but that car broke down now i have a buick park ave that came with stock speakers and a new kenwood stereo i switched the back speakers with the old ones because when i turned the volume all the way up they distorted even though i changed speakers they still sound distorted is it the stereo?i have a Kenwood KDC-138 i dont know what it could be help
 
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