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Sony MEX-M100BT
Soundstream pn4.1000d amp
Scosche handlebar control interface
2012 FLHTK
I don't use my radio every time I ride but I just noticed that the rear speakers have a very low volume. I checked the gain, switched the rca cables, and confirmed that all the speakers work. What should I check next? Either my head unit or amp took a crap. The amp is working and the green light is on and the front channel works. The head unit is less than a year old and never got wet. I'm not great with audio and wiring it, but I'm 99% sure everything worked not too long ago.
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