Answers: huh? well the actual speaker is what vibrate, all an amp does is suply power to the speakers. immediately if you want to make your speakers louder you would hook them up to an amp (that puts out more watts than your radio). buying unknown speakers will not make your radio any louder if i.e. what you are getting at.... and the answer to your question is the amp is what ADDS tremor, i hope that helps, correct luck
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