Thanks for the information. I notice the business is located in CA, but also that he travels to work on the cars. Does that mean it costs a whole ton? For those of us in the northeast, it might be easier to go to Tweeter's custom installation center than to fly a professional out from CA.
Regardless, all I have is the two front dash speakers and the stock head unit...and in my last car I had a very nice custom stereo, so I'm going to need to make changes.