What Is the Quietest Car Sold?

Test drives are going to give you the most self-targeted real world information. But most high end vehicles are such because that is one area they invest the extra dollars in.
( rented a 2010 corrola last week and OMG the road noise on that thing ! )

And, on the high end suject, you’ll need MORE sound system to hear LESS volume better.

Yes, the top end sound systems being more powerful also have more and better speakers.
You get much much better LOW volume listening, ie better clarity with a Bose, JBL, and other factory top end systems which are specifcally tuned to the vehicle’s interior.