Yes, there is a sub with all BOSE. The AT4x and Denali Ultimate get some more speakers. Someone had posted radio info from GM on this not long ago, can't find it. As for the sound quality, I also came from a 2019 BOSE to the new 2022 refresh BOSE. I agree, the 2019 was better. A few things... make sure if you are listening via your bluetooth phone, and android auto be sure you adjust the EQ on your phone. Also, I use YouTube music for everything. I found that listening to YouTube music direct from the build in truck app OS, vs YouTube music via my phone (android auto) the sound quality is much better going directly with the truck OS YouTube music.