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I'm embarrassed to say, my door speakers aren't working, either! After adjusting the bass boost and other effects, I was getting decent enough bass not to notice at first. Checked the fuse and it looks fine. Seems the HU is just not communicating with the amp that powers the door speakers. I have an email in to Carbon. They installed one of these in a 2017 BRZ, so they should have some insight.
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