first fg sub box w/pics

Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=111217
Printed Date: May 14, 2025 at 3:06 AM

Topic: first fg sub box w/pics

Posted By: ryan95x
Subject: first fg sub box w/pics
Date Posted: February 01, 2009 at 1:21 PM

Hey guys, I've been hanging around this forum for the last couple of years and enjoying the custom work that everyone posts. I have been wanting to build something and I finally had a chance to so here it is, let me know whatcha think:

posted_image

Replies:

Posted By: joeskey
Date Posted: February 01, 2009 at 6:42 PM

pretty cool, do u have any pictures of the start of the build>?

Posted By: ryan95x
Date Posted: February 02, 2009 at 7:38 PM

I have a couple of pics on my phone, I will see if I can get those on here. I ended up bolting the box to the body through the bottom of the box and I am very satisfied with it's rigidity. I also used hex head bolts with t-nuts to mount the sub so in case anybody were to break in and try to steal my precious, they will have one hell of a time! Lol.

Posted By: slab42
Date Posted: February 03, 2009 at 1:57 PM

What is the airspace of that enclosure? Also, all the hex head screws do is make it so a potential thief will cause more damage. Either way you will be wized. :(

Posted By: ryan95x
Date Posted: February 03, 2009 at 3:06 PM

Here is a pic of the box before it was finished, it is about .5 cu. ft. I ended up laying the fiberglass from the inside but it didn't end up mattering since I carpeted it. I used about 3 layers of glass and that seems to have been more than enough. For the stuffing inside I just gutted an old cotton pillow :-D

posted_image

As far as the build process goes, I just followed the basics:

1. Tape up area to be glassed. 2. Lay several layers of fiberglass. 3. Remove once hardened and trim. 4. Support the speaker ring. 5. Stretch fleece, glued to the back. 6. Resin and fiberglass until satisfactory

I am powering the sub with channels 3 & 4 of my power acoustik ps4-840 amp so it is getting about 170w RMS, and each of the front components are getting about 80w RMS from 1 & 2.

Feel free to comment or ask questions, I will be of as much help as I can. :-)

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-Dual XHD6425 - HD Radio w/USB & 3.5mm in
-Power Acoustik PS4-840
-Infinity Components
-10" Clarion SW1051 in FG molded box

Posted By: elmaschingon_18
Date Posted: February 10, 2009 at 3:23 PM

Does it even hit? .5cu? seems too small for some thump.

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sanding sucks!

Posted By: ryan95x
Date Posted: February 12, 2009 at 1:23 PM

Yeah, it hits really nice. The manufacturer suggests .5 ft3 net volume in a sealed box for this sub. The sub's rated at 300w rms and I have 180w rms going to it which seems like more than enough.

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-Dual XHD6425 - HD Radio w/USB & 3.5mm in
-Power Acoustik PS4-840
-Infinity Components
-10" Clarion SW1051 in FG molded box

Posted By: jinstall
Date Posted: February 17, 2009 at 7:20 PM

it's an entry level sub in a sealed box. .5 cubes is fine.

I wonder how many layers of glass did you use? boxes that are glass only don't have much strength and you do lose a lot of sound because the enclosure itself resonates, because glass is a LOT lighter than MDF. looks good, just wonder if it could sound better.

if you do have thise problem try glassing a bunch more layers, if you don't feel like doing all that, at least pull the sub out one last time and spray a bunch of rock guard in the box to weigh it down.