bmw e39 custom sub enclosure

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=92528
Printed Date: May 09, 2025 at 5:01 PM

Topic: bmw e39 custom sub enclosure

Posted By: renn
Subject: bmw e39 custom sub enclosure
Date Posted: April 04, 2007 at 5:20 PM

Hey all, first time poster. Hope this isn't too redundant and/or basic.

Anyone familiar with e39's give me an idea on how to go about doing a custom 10" sub enclosure that would fill the little cubby where the battery compartment resides? This pic shows what I'd like to do but just don't know specifics like what dimensions would I need to make the enclosure, what materials best to do such a shape.

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Replies:

Posted By: renn
Date Posted: April 04, 2007 at 5:57 PM

Here's 2 pics that show the trunk area with the factory panel.

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Posted By: ricoshay
Date Posted: April 05, 2007 at 10:31 AM

1. foil/tape it

2. apply resin...let it harden...remove mold

3. apply resin/fiberglass matt to mold until you can't flex it with your thumb

4. postion/secure an mdf ring wher you want the sub

4. strech fleece TIGHTLY over the ring and secure it to the mold

4. repeat steps 2-3 to fleece

5. aplly body filler, sand, apply carpet.

if you search, the details are all over this forum

Posted By: auex
Date Posted: April 05, 2007 at 2:10 PM

I would recommend the other side of the trunk for easier access to the fuse panel and battery in the future.

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Posted By: alphalanos
Date Posted: April 09, 2007 at 10:30 PM

The best advice is to go slowly and plan it all out. All the mistakes I make are due to rushing. So go slow, make sure everything is right. When making the mold, be sure to lay enough glass on it so that it is very strong, the stronger the better. another tip is to draw a line with a sharpie where you want the edges to be before you lay your glass, then the line will transfer to the glass making it easier to cut. then when you trim it with a dremel, be very precise as this determines how well the edges of your peice will look. use a router to make a mounting ring from MDF and postion it with dowels and hot glue/ca glue. stretch the fabric as tightly as you can( another reason to make the mold very strong.) apply resin making sure you soak throught the fabric so that it will stay attatched when you trim off the excess. apply a few layers of glass. then do your mixture of resin/ body filler, sand, and finish to your liking.