Overhead Speaker System
I've found the same speaker problems you did. Our 1st GT I mounted rear speakers in the package tray under the rear window. Sounded OK as long as the windows were shut.
My son's GT, we put speakers in the back panel, below the vinyl flap for the spare tire, and facing the back of the seats. But anything like luggage in the back, and you block the sound.
So I'm looking at the Overhead Speaker System found in JC Whitney. Its got 2 woofers, 2 mid-range, and 2 tweeters and mounts to the under side of the roof.
The other option I'm looking at is replacing the GT seats with Miata seats that have the built-in speakers in the head-rests. This looks like a real clean solution.
For the system, I'm thinking of a JVC CD with MP3 capability, and a ten-disc CD changer. For the changer, I'd like to build a lockable compartment in the back. Ya know where the luggage platform is. I'd like to extend that up by 10"-12" with a hinged lockable lid. One of the big problems with the GT is the inability to secure wallets, laptops, etc.
I make it a practice not to lock my cars, so I really need a secure compartment.
Anyone else found a good solution?