Well, for one thing your speakers are all aiming away from you if I see the pictures right. The ones under the dash are shooting straight down (and are tiny) and the one in the trunk seems to be aiming back. I am no audio guy, but I think that the sound should be coming at you to get the full effect, especially in something as noisy as a roadster (compared to a Cadillac for example). Also, bigger is better when it comes to speakers, and a good amp will help out too.

Don