I recently installed the factory Kicker sub woofer to my Bose system, it is a big improvement but something is weird, I have to set the bass at -12 on the tone and the mid and treble at +7. I looked at the sound using pink noise and a real time analyzer. Those numbers got me closest to a flat response curve. I have done some checking on line and as soon as you install any kind of sub especially aftermarket the ANR starts fighting you. Amazon has a cable that you connect to the amp to shutdown ANR, just got to pull the console to find the amp and see if it will work with the 19. System. I understand what ANR does studied wave cancelation in high school physics. I know enough to know I don’t want it. Anyone adding a sub to Bose might want to check into this.