Audio Upgrade Question?





Last edited by Squeaky Wheel; Jan 24, 2019 at 02:24 PM.
I started with the power wires, got the face plate lit up, then tuned a radio station and hooked up the speaker wiring one by one until I had the two rear speakers sounding good. The two front door speakers were a different matter, it didn't work with the Bose system. I intended to just bypass the Bose wiring but ended up using existing wires that DID pass sound without distorting it, after replacing the two big Bose door speakers with high power 3 way car speakers from Walmart. It all worked very nicely, actually sounds better than the original Bose system. Other issues were the antenna plug, and the rear mount for the tuner. Instructions recommended sawing the stock aluminum mount off but I wanted to be able to re-install the original radio someday so I cut a notch in the mount that the tuner fit into. There was a size difference between the car antenna plug and the tuner antenna socket, another trip to Walmart found a $10 bag of mounting parts with a 90 degree antenna plug adapter inside. It fit perfectly and I completed the installation listening to the radio.
The recommended dash mount kit worked after sorting out the instructions. The radio is a single din unit needing a mount kit with a faceplate to fill the Vette's larger hole, I think it looks pretty good and the whole project cost around $150. The only mistakes I made were connecting the dimmer wire to the wrong lead, it won't go dim with the dash light control, and the radio is independent of the ignition switch. I discovered these problems after it was all together, minor issues considering the enjoyment I get from this new system. I plan to correct the 2 wiring issues during the next trip into the dash to replace the leaking ac evaporator, which stopped leaking after I installed a can of R-134-A with stop-leak and oil. So I may have to turn the radio on and off manually for a while yet.
I read up on using the USB system to play music files from a PC, bought a thumb drive and loaded it with mp3 music as both albums and individual song files. I thoroughly enjoy playing MY MUSIC through the USB system, not having to carry a big folder full of CDs to fumble with on trips is worth the effort to install this sound system in my favorite ride. Also, the tuner can be set for random play of song files. Later, I discovered that I could have bought a radio tuner/USB/BT unit without the cd drive for less money. I used to sell and install high end stereo systems in rich people's houses so I know what good sounds are, What I am getting is pretty close except that I didn't go for heavy bass in my system, although it could easily be added to what I already have.
On researching the compatibility issue I ran into I found that to use the Bose sound system, An INTERFACE unit is needed to go between the new radio and the Bose System, I found that Best Buy and Walmart can special order an interface unit for $40-100 depending on who you get it from. Since my system was already up and running I didn't bother with that solution. The instructions with the new radio list the wiring pin-outs, all you need is the radio pin-outs for your car and make a pin remover to get the pins out of their sockets without damage(not difficult). Another route is to trust a car stereo installer chain store with YOUR VETTE to put their system in for at least $300-400. I almost went that way but the idea of some greasy mechanic pulling my dash apart didn't sit well.
Last edited by sjhanc; Jan 24, 2019 at 03:07 PM.

I found a refurbished kenwood ddx on ebay with the metra dual din center console and the plug and play wiring harness to allow factory Bose amp and speakers to work. Sounds as good if not better than stock and has all the modern conveniences with that updated look. One of the best upgrades I have done to date. I dont have any pictures but if you do a search on c5 dual din you will find plenty. Good luck.
Last edited by Jpoeling1; Jan 24, 2019 at 03:39 PM.
The Best of Corvette for Corvette Enthusiasts
https://www.corvetteforum.com/forums...ss-system.html


Last edited by Bobd207s; Jan 24, 2019 at 10:31 PM.
https://www.google.com/search?newwin...w=1280&bih=689
The Metra bezel looks good, but is considerably different from the original bezel, the Vette Nuts bezel looks very, very similar to the original, but pretty much everyone has to shim the A/C control out about a 1/8 to 1/4 inch.

You will also need a Double-DIN bezel. Vettenuts offers one that is topnotch, but not inexpensive. There's a less expensive option, although not at the same quality level, from Metra. You may want to compare them before making a decision.
Regarding the headunit, these are basically the main options available. If you want to keep the Bose infrastructure, Option 4 is the way to go (although you could just do Option 1):
- Replace just the headunit, leaving the rest of the system intact, using either one of these adapters:
- (this one preserves the RAP feature)
- Keep the headunit, but replace everything else adding a multichannel external amp driving new speakers through new wires by using
- Replace just the 4 twiddlers with 2-way coaxial speakers leaving the rest of the system intact
- Combine 1 and 3
- Take everything out and replace all from scratch
That being said, without a doubt, the easiest and least expensive way to upgrade the system with the more bang for your buck is new speakers that can be bolted on in place of the factory ones, keeping the rest of the system intact.
The C5 OEM speakers do not include any real tweeter. Bose used 4 plain-cone (paper) speakers to handle high and mid frequencies and called them "twiddlers". That's why you can make a big improvement by replacing them with a 2-way coaxial design.
OEM C5 Speaker Sizes:
-Front
Twiddler: 3.5"
Subwoofer: 8"
-Rear Twiddler
Coupe: 6.5"
FRC/Z06/Convertible: 5.25"
For bolt-on speaker upgrades, get 3.5" 2-way coaxial speakers to replace the doors' twiddlers and 2-way coaxials of the right size for the rear. Don't touch the OEM subwoofers.
Considering that the OEM Bose twiddlers are 2 ohms, the JBL GX Series @ 2.3 ohms is an excellent replacement. These speakers have a soft dome tweeter, which should deliver a smooth sound with a wide dispersion pattern. Add to that the Harman-Proprietary Tweeter Deflector, that according to JBL "acts as a waveguide, allowing for an angled, rotating speaker, which optimizes the off-axis sound performance. Because all cars are designed differently, this allows impeccable sound to travel throughout all locations in the cabin".

JBL GX Series 2-way car speakers:
- GX302 (3½")
- GX502 (5¼")
- GX602 (6½")
Not only they are from the same manufacturer, but they all belong to the same line. This should reasonably assure you they have the same timbre.
You are going to need as well. One kit will do both rears.
Independent confirmation that upgrading the 4 twiddlers makes a noticeable and worthwhile upgrade.
Last edited by GCG; Jan 25, 2019 at 03:06 PM.
Last edited by RB67; Jan 25, 2019 at 04:49 PM.
- iSimple PDXP (found a used one on the auction site for $30)
- iSimple PXHGM4 harness ($15 from a couple different sites)
- Any 30 pin bluetooth receiver ($20 from the site where 2 day shipping has turned into 5 day shipping most of the time. you can probably find one cheaper if you don't care about hands-free calling)
Took me about an hour to install and darn near CD quality. If you really don't care about having hands-free calling AND you have an OEM changer in the "trunk", you can just use harness PXHGM2 and install would only take 2 minutes.
The only reason I went the PDXP (30 pin model designed for iPod use) route is because it powers the bluetooth receiver. If you use the PXDX "auxbox", you'll need to find a way to power the bluetooth receiver as well.















