Dropped my truck in for the pedal recall and other work, and was complaining to them of the low H/K 19 volume with some knowledge of this issue. The desk twerp was trying to downplay it and tell me that's just how it is. I press and tell him I have a premium H/K system in my other vehicle and it decimates the sound of this $2700 option, and his response was "well that's a smaller vehicle isn't it" .. well sure but ok pal I'm sure it's just me. He calls me later to say they couldn't find a flash for that issue, only something for the nav which I tell him there's no issue with the nav.
Fast forward to today, I find the TSB 08-123-18 and have them check my VIN. Lo and behold, yep that's the one .. flash my amp in witech please. We'll see when I get it back but my fingers are firmly crossed. This system has been vastly disappointing so far.