You should try the Bowers and Wilkins system in the BMW iX some time. In the USA it’s $3,400 extra compared to their mid-range Harmon Kardon system (which itself is an upgrade from the base system), but it sounds amazing. 30 speakers including one in every head rest, two subwoofers under the floor, and 4 bass shakers in the front seats. 1615 watts total. Sounds better than some home cinema setups I’ve heard.