I checked the subwoofer in the truck and the screw holding it down was loose. Tightened it up and it sounds a bit better. I'm still using +4 bass and +2 treble though. Always below 15 volume, typically between 9-12. I can feel the air move out of the subwoofer port, and it vibrates, but it's not the best sounding sub I've heard haha. Guess that's what you get when you mount a sub on top of the spare wheel!
I think it depends on the sound source as well. I fixed the bluetooth hissing with a better 12v to usb adapter, and some internet searching shows that sirius radio does have a muffled sound compared to CD/FM.
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