Fixed it! Both speakers were dead. Sequentially pulled the door panels and swapped each speaker with known good spare speaker. It worked! Plugged bad speaker back in - it didn’t work. For grins did another easy test - wired a 1.5vdc AA/AAA battery across the +/- posts. Heard static tone on good...
Ditto same issue with my 2015 1500 Laramie Alpine system. Noticed it after having the sub unplugged for a week while doing rear window slider work. Had truck in ACC mode to exercise pwr window so stereo was powered up w/out sub connected too. Plugged sub back in & sound system had tinny sound...
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