G-Body Rear Deck Speaker Adapter 6x9

***************Notice***************

This design is intended to be printed with 100% infill and may be subject to failing with less infill/few perimeters as it is a load-bearing part.

This design requires the original tab-style mounts in the rear deck. Double check and make sure your car has identical speaker mounting to these pictures:

Introduction

This speaker adapter was designed specifically to fit modern 6x9 Kicker 3-way speakers in the 4x10 rear deck speaker locations of a 1986 Chevrolet Monte Carlo SS without cutting any sheet metal, drilling any holes or bending any trunk torsion bars, while utilizing the original speaker mounts. With these, the car can be quickly and easily switched back to 100% factory form with the original 4x10 speakers and tray mount if desired. This adapter should work in most other G-body cars with most 6x9 speakers. The Kicker speakers I have linked are relatively large, so it is unlikely that speaker choice will cause fitment issues with the trunk torsion bars. I cannot speak with absolute certainty to the fitment of these adapters to non-monte carlo G-body's, so if you make one of these for a different G-Body, let people know in the comments how it worked out for you.

This speaker adapter is mostly 3D printable, but will also require some 1/8" diameter rod(hard/stiff rod is better) and access to some common tools that should be available in almost every shop.

I printed my adapters out of CF PETG , which is strong, has suitable temperature resistance for my geographic area, excellent layer adhesion, is quite stiff and provides somewhat similar acoustics to wood. I recommend you also make yours out of CF PETG , PA6 CF, or possibly PETG. I would advise against printing this out of PLA or ABS, as the poor layer adhesion of ABS will likely result in failure on the first rough road you drive down and PLA will eventually melt with the load of a heavy speaker installed.

If you are sufficiently happy with how this design has worked out for you, please consider sending a donation my way if you are able: https://buy.stripe.com/bIY4i488N84rcCY3cc

Notable Printing Considerations

- This is a load bearing part subject to the slightly cantilevered weight of a large speaker. It is imperative that layer adhesion is very close to perfect and the part has 100% infill.

- It is recommended to print the parts out of CF PETG , PA6 CF, or some other material that has excellent layer adhesion, strength and good enough temperature resistance for your area.

- If printing with a carbon fiber-filled filament, ensure layer heights do not go below 0.2mm and try to keep a 0.25mm+ layer height where you can to prevent clogged nozzles.

- The adapter parts are quite large and may be subject to warping without a suitable enclosure or poor bed adhesion.

Parts List

Part Name

Qty

Print Hours

Mass [grams]

Material

6x9 Speaker Adapter Driver

1

14.75

261.34

CF PETG

6x9 Speaker Adapter Passenger

1

14.75

261.29

CF PETG

G-Body Rear Deck Speaker Adapter 6x9 Spacer 0.5_ v1

2

0.25

1.71

CF PETG

G-Body Rear Deck Speaker Adapter 6x9 Spacer 0.375_ v1

0

0.2

1.29

CF PETG

G-Body Rear Deck Speaker Adapter 6x9 Spacer 0.625_ v1