The Ford GT system was a very tough challenge. The system uses custom 5 1/4" two ways in the doors and a 8" sub in the center console. The amp is very compact and is 75/75 watts for the door speakers and 150 for the sub. The amp has an internal crossover and EQ for the whole system.
The sub also functions at a higher frequency midrange speaker where it throws a phantom center channel image on the windshield for center fill. The sub is 2" deep and uses a neo magnet inside the front of the cone suspended on a cast aluminum 'spider' frame.
All of the speakers are custom designed for the lowest possible weight and use neo magnets. The head unit is the normal MX406 CD/FM/AM unit with logo and trim color changes to match the GT.
The interior of the GT is metal and rubber for the most part so the acoustics are a challenge. Behind the driver and passenger's head is the 550 HP, EPA certified motor which tends to drown out the sound system.
To design this type of system required half of the McIntosh engineering department for many, many months. Car audio is always tougher to design than home audio. The GT is such a cool car though, all of the effort was worth wile.
Ron-C