Well, take your pick:

Mercedes-Benz - Burmester Audio

Cadillac – AKG Audio

Volvo – Bowers & Wilkins Audio

Chevrolet – Bose Audio

Lexus – Mark Levinson Audio

Audi – Bang & Olufsen Audio

Land Rover – Meridian

Lincoln – Revel

Jeep – McIntosh

and some Tesla models use Bang & Olufsen.