Unfortunately agreed on the Harmon system volume. I’m
happy with sound quality overall but was literally driving the truck home from the dealer and was “comfortably” listening to xm radio with the volume knob at 100%.
I did not try other audio sources.
I did disable surround sound, it was even quieter with surround enabled.
I have a 2011 with the alpine system and I don’t think I’ve ever turned it to max volume, certainly it reaches levels that are uncomfortable inside with the windows up.
This IS unusual, I can’t remember owning any other vehicles where I would find myself turning the volume all the way to max.
Edit: I tried the USB input from my iphone, and max volume was considerably louder than XM.