Okay, I will admit it: I am a psycho! Besides that, I like fast [okay, scary fast] cars and clean, loud music [okay, I want the ability to remove anyone from the car with the stereo...no James Bond ejection seat required].
Solution: if you look at the linked thread on my 'vert, we built dual roll bars behind each seat [come on, Iacocca wanted this car to be a 2 seater...]. Nestled inside of each roll bar will be an Elemental Design 16Ov.2:
They will be wired w/ each 4 ohm vc in parallel, and each speaker in parallel, presenting 1 ohm to the Elemental Design 9.1 producing 1200w @ 12v:
Look...I turn 50 next year. If you're going to have a mid-life crisis, have it in a totally insane 40+ yr old Mustang 'vert w/ 800+ hp and too much stereo.
Questions?
Seriously, getting adequate bass in a convertible is always hard as you lose cabin "near field" reinforcement. Even your house is better. Basically, this system will have to supply bass to the entire world, w/ the response dropping exponentially as you get away from the driver. In my case, this car should play loud and clean...20+ feet away.