I followed the guide regarding sound issues and connected the Amp Con wire to the stock non-JBL amp trigger wire under the passenger seat and also toggled the amp option in the radio menu. Doing so gave the truck a lot of bass, but the sound is still not right. I can barely hear the songs. The C12 stereo is installed in a 2021 Tundra. Is there another wire I need to connect to complete the sound system? There is very little information on this installation issue.
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