“There are 4 speakers in my 2004 Trailblazer. Are there front and back speakers and do I need a harness for each speaker. Thank you.”

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• You only need two. In a package, there is a pair. So you need to purchase two harnesses.

  Answered by Bjay 6 years ago

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• Yes. one for each front speaker they have 2 connectors per each speaker a postive and ground wire.

  Answered by Christopher 6 years ago

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• Yes there are front and rear and each speaker does require a harness. Just replaced 07 hummer with JBL speaker upgrade

  Answered by Dallenman 6 years ago

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