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If it says BOSE on it anywhere it will have an amp for each speaker in the doors. The Factory GM radio does not have an amp and has poor sound to amplify. Most members of our forum choose and after market stereo to amplify. Come and read in our AUDIO section

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15y ago
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Q: How can you tell if your 2004 Chevy Trailblazer has a factory amplifier or not?
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