I can't comment on Aero based cars but having taken my 4/4 4 seater to a car audio specialist who has done old Astons, I went with a new system which included a Sony powered sub woofer under a false panel in the passenger footwell, it shortened the footwell by about 150mm but boy what a difference it's made to the sound
It can be cranked up LOUD with no audible distortion, full frequency range
I think the powered sub with frequency crossovers is the key
