TAC Tech => Audio => Topic started by: cyber104 on February 05, 2019, 06:45:45 PM

Title: Cutting speaker holes in rear package tray that is already installed
Post by: cyber104 on February 05, 2019, 06:45:45 PM
Hi All:

Is there an easy way to cut speaker holes in a rear package tray that is already installed?

The package tray already has a black "mesh" over it and where the speakers would mount is just a series of 1/8" holes.

It seems to me that if I don't open up the speaker hole before I install the grills - the combination of 1/8" holes in the tray and the new speaker grills may restrict the sound coming from the speaker.

These clips look like they are intended to be used with the package tray I have - but can I install them from the trunk or do I need to pull the package tray back out?

http://www.firebirdcentral.com/1967_1981_Rear_Speaker_Mounting_Stud_Spring_Clip_p/das-1009.htm


Thoughts?

Thanks,
Chris
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: NOT A TA on February 05, 2019, 08:13:39 PM
Hard to cut it without making dust. For that reason alone I'd just pop the back seat out and slide out the package tray. Then use a jigsaw. You'll be able to do a nicer job quicker & easier by removing the package tray.
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: squirrel on February 05, 2019, 08:43:24 PM
use a sharpie to trace the cut out speaker holes from inside the trunk then remove the tray and cut out the holes and reinstall. 
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: Aus78Formula on February 05, 2019, 08:54:07 PM
As said, easier to do it properly.
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: cyber104 on February 06, 2019, 02:01:35 PM
Will do - only trick will be to cleanly cut thru the heavy felt backing which is glued to the underside of the tray
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: Jack on February 06, 2019, 02:57:19 PM
Be careful mine (72 bird) had metal mesh reinforcement.
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: cyber104 on February 06, 2019, 04:19:35 PM
Anyone had any luck with surface mount speakers?  I know they would look not so great but it sure would be easy
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: cyber104 on February 09, 2019, 04:58:35 AM
Hi All:

Here's what I decided to do..........

I got in the trunk with a single edge razor blade and using the speaker holes in the metal as a template I carefully sliced thru the jute/felt backing.

Then I peeled the oval sections off the underside of the tray.  This exposed a series of 1/4" holes that were drilled in the tray for the speakers.  The entire top of the tray is covered in a black mesh.

My plan is to use these clips to secure the speakers to the underside of the metal thereby making no cuts into the tray - it should work:
http://www.firebirdcentral.com/1967_1981_Rear_Speaker_Mounting_Stud_Spring_Clip_p/das-1009.htm

Here is the type of tray I'm working with:
https://www.firebirdcentral.com/1970_1981_Firebird_Package_Tray_with_Mesh_Screen_p/int-456m.htm

I'm hoping that the holes are acoustically "transparent" enough - I don't know enough about that stuff to tell for sure.

Chris
Title: Re: Cutting speaker holes in rear package tray that is already installed
Post by: Nexus on February 09, 2019, 02:58:15 PM
This is what I was going to suggest to do when I got to the end of the thread but you beat me to it. I think this is a good way to do it. If you find out your not happy with then you can always go back and trim out the 1/4 inch holes but its harder to add it back once its cut out.