Has anyone put new speakers in the stock housings in the C4? Did you have to modify the housing?
My front amplifiers are completely corroded and I want to put in a bluetooth amplifier
and replace all the speakers. But can't find any that I know will work.

 

In my 89 convertible 6X9 speakers were a direct replacement in the back, but coupes might be different. I put 6 1/2" speakers in the front door locations, but some modification was necessary.

 

Contact Dr Don in Texas, get new front speaker amps and new speakers with amps for the rear. Front speakers are cloth and will last a lifetime, rear are paper and after 30 years are shot.
http://doctordons.com/

 

Has anyone ever found a halfway decent 1.5 DIN head unit for the 84-89 cars?

 

My 84' had the BOSE and it needed everything replaced to be functional again, all four speakers had torn paper cones and two blown amps. The head unit was useless with the cassette and lack of Bluetooth. I just don't like the look of an aftermarket radio in the C4, something about it rubs me wrong, the color of the lights, the fonts, just everything is just TOO wrong for my liking.

My solution was a late 90s Chevrolet radio (S-10, Venture van, etc) so I get the similar appearance and it fits the 1.5 DIN perfectly. Notice that the radio is screwed into the car with correct screws as designed, which was achieved by 3D printing a pair of brackets using ABS for durability. I designed it so the radio is attached to the car in the stock location without modification to the car, using stock screws and mount locations. My goal was to leave the car intact completely so the next owner (MANY years from now, hopefully) could simply plug the BOSE system back in. I created a wiring harness that plugs the new radio into the car, along with new speaker wires. You'll notice the little "button" fits into the new radio mounting hole and there are holes that allow you to screw in the rear screw from the front; that is the reason for the half-moon hole in the upper/right corner.


Late 90s Chevrolet radio mounted to 1984 dash


3D Printed Bracket


3D printed brackets and small notch to plastic in the rear

The speakers in the rear were replaced with traditional 6x9s and the empty front dash were filled with whatever size fits there, what 6.5" ones? New Crutchfield speaker wire pulled through the car (HIGHLY recommend their wire!!) and this is what I have completed:


Completed
One more thing, before installation I managed to find LED bulbs on eBay that match the colors of my other bulbs in the stack, so my A/C controller, radio, and top panel with switches all have LED bulbs now, which looks GREAT at night.


LED lights everywhere, including dash cluster, a/c controller, radio and switch panel.

Stack at night with automatic glowing with 2 LED bulbs instead of one from factory.

My solution keeps the car convertible back to factory Bose if someone should want to with no modifications to the car body, I gained LED bulbs everywhere, modernish CD radio that is PLENTY loud with quality aftermarket speakers (Just as loud as my Bose ever was), and for Bluetooth I assembled a Bluetooth module with FM modulator that plugs into the antenna jack so, stuffed into the dash; tune to certain frequency and sync your Bluetooth, works great. Look on eBay for these Bluetooth modules costing something like $14 or so, very nifty little devices.

I like that the car looks essentially "factory" and most people wouldn't even notice it was aftermarket. Next time the radio comes out I'm tearing it apart to make the SCV (speed controlled volume) switch turn on/off or up/down the rear antenna, allowing me to have the antenna down playing Bluetooth or CDs. I am MORE than impressed with the volume of this stock unit, again, with quality speakers installed..

For another day in the coming months I am eager to announce to the C4 world this new part I just created during the radio upgrade project:

Cool new toy for all C4s coming soon.

 

Nice project! Any chance you'd sell me a set of the brackets? I have access to a 3D printer so I could buy the file too if you prefer. PM me if you are interested in that. Also, do you know if that chevy radio will operate the stock antenna?