Thanks for the response. For me, I have MCU1 (missed MCU2 by just a couple days or less...grrrrr....). For the first day or two, my sound was outstanding. Then I got an update (2018.10, i think) and the sound was noticeably worse no matter what I tried. Then I got 2018.12 and it sounded better, with some EQ tweaking, but still not as good as original. So, I'm hoping that one of the newer updates (2018.14 or 2018.16) will get my sound back to the level I had for just a brief time when I picked up the car.
Note that earlier this month, I contacted customer support and received an email back that included this statement:
"We are currently aware of the update affecting the EQ levels. We are looking to patch this up very soon so that we can bring that amazing sound back to the vehicle. We appreciate your patience...{etc.}"
Note that my request/complaint was not specific to the EQ level issue (they had changed the EQ scales from 12 to 8), but rather the quality of sound generally. So, I remain hopeful that they'll get the sound back to 'amazing' in my car. Fingers crossed that whichever update I get tonight (.14 or .16) will get this done!