Some people really like their music. Other like to share their music with as many people as possible. These photos show some crazy ICE (in car entertainment) installs. This is what I would call NICE ICE. Rather than have space for 2 passengers the seats have been replaced with speakers and amps. It is certainly a good idea to have a number of speaker sizes and set up the crossover points for each separate bank to get a full and unparalled clarity of sound.
These have to rate as the largest speakers I have ever seen installed in a car. The actual spaeakers must be getting on for 70-100cm in diameter. Think nightclub on steroids and you get close to the power of these baby’s.