Audi Pune - The Audi Q7 comes with the BOSE 3D Sound System with 19 speakers, centre speaker, and a subwoofer. It has a 15-channel amplifier with a total output of 558
Q7 4M/4.5M -- Subwoofer Upgrade w. Photos - AudiWorld Forums
Audi Q7 2007-2015 OEM Rear Bose Subwoofer 4L0010549