“Is an amplifier needed for these speakers? Also, for a 1999 extended cab gmc sierra, are these for the front door speakers, the rear speakers, or both?”

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• No, you can just plug and play from your old speakers. Of course they probably would sound better with an amp, but I assume if that was the case, you'd be looking at much more expensive speakers.

  Answered by CheapGuy 4 years ago

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• The speakers are rated 30 watts so an amp isn't necessary. Looking at the speakers and your vehicle they are compatible with your vehicle.

  Answered by Kenwood Product Expert 4 years ago

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