I have an Audi A5 coupe. The problem is the way my seats fold forward, and also the size of the boot lid - can’t physically get a double bass into the back. You can just about get it into the passenger seat, but you have to choose between being able to see or being able to shift gears, so it’s really not ideal.
The Eminence goes in the back seat without breaking a sweat, and I can fit an amp in the boot without too much trouble. I’ve brought a full PA in the car with it!