E90Post
 


E92 Lighting
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY How to build a Corner Subbox



Comment
 
Tutorial Tools Search this Tutorial
DIY How to build a Corner Subbox
Published by M3Tuner44
06-02-2012
DIY How to build a Corner Subbox

So I wanted to build a sub box for the 335i but didn't want to pay $300 for whats already out there. I have built a bunch of these before and I knew I wanted something stealthy and not to abrupt when you open the trunk. So I went for a simple corner sub.

To start lay blue tape in the area you decide to make your box, lay the tape beyond where you want the box to go and you can even put a couple layers on if you want. Also put some oil on the tape so the mold doesn't stick to the tape.

Apply the fiberglass resin to the tape and then start to apply your fiberglass on top of that, then put more resin on top. You really only need 1-2 layers of fiberglass while its in the car. You car will smell for a couple weeks, so you don't want to do all layers in there or else it will get pretty bad. I did 6 layers.






So I knew I was going to use a capacitor with my setup and like I said I wanted it all to be clean when you open the trunk so I decided to put the capacitor in the trunk. I first used construction paper to cut a template for the break point and then transferred the template to 3/4 mdf. Also at this time you can trim the box and cut it to how you want it to sit in the car.







Then I fiberglassed the breakpoint section and also fiberglassed the capacitor holder.






Then it was time to make the sub ring. My routing bit on my dremel wasn't working so I used a marker to make the outline and then cut out the ring with a jigsaw. I wanted the subwoofer to be flush so I also cut a 3/4" trim ring.






Then decide how you want the sub to sit and hot glue wooden dowels in order to hold the speaker ring in place.





Now after you have that all placed take some stretchy fabric or shirt and cut it in half so its not layered. Spray 3m 77 glue onto the sides of the box and stretch the fabric tightly over and give it time to settle, this glue tacks right away so you can apply to fabric immediately. Then apply resin to the fabric and let it harden, don't apply to much pressure at this time or else the fabric may collapse. After its hardened apply a few layers of fiberglass. After thats hardened put some fiberglass between the sub-ring just for added strength.



It was raining this day so I used my electric heater and an air purifier/pusher.



After 2 layers of bond and a lot of sanding. If your going to lay carpet over it, then it does not have to be completely smooth and filed in but if you are going to paint it then you will have a lot of work getting the waves out and filling in each pinhole because it will show.





Carpeted and fit perfectly. It sits right in the tray about the logic7 amp. This setup does not move at all even under aggressive driving. It holds in there really well even without bolts or velcro.






I will be covering this with a carpeted grill so its hardly noticeable
Tutorial Tools
  #1  
By 335iJWC on 06-02-2012, 11:45 PM
Very nice! hows the sound?
Reply With Quote
  #2  
By M3Tuner44 on 06-03-2012, 11:18 AM
Member reviews
Difficulty [ 1 = Difficult ]
40%40%40%
2
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
80%80%80%
4
Average 47%
Quote:
Originally Posted by 335iJWC View Post
Very nice! hows the sound?
It sounds good. Definately better then stock. It's the proper size box for the sub
Reply With Quote
  #3  
By blingman on 06-07-2012, 02:18 PM
How much to make another? or group buy?
Reply With Quote
  #4  
By 2turbodinan on 06-08-2012, 06:40 PM
Well done lad! Sometimes it seizes to amaze me how creative people could get on these forums
Reply With Quote
  #5  
By M3Tuner44 on 06-09-2012, 08:49 AM
Member reviews
Difficulty [ 1 = Difficult ]
40%40%40%
2
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
80%80%80%
4
Average 47%
Quote:
Originally Posted by blingman View Post
How much to make another? or group buy?
I've made a few for others and i've charged $240. It depends on what car you have. If you have an e92 I can use my car to make the mold, but if you have an e90 ill have to use your car.
Reply With Quote
  #6  
By import36 on 06-09-2012, 09:46 AM
Member reviews
Difficulty [ 1 = Difficult ]
20%20%20%
1
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
20%20%20%
1
Average 20%
looks great! but this is definitely something i wouldn't attempt to DIY!
Reply With Quote
  #7  
By CharlieBear on 06-12-2012, 06:38 PM
Member reviews
Difficulty [ 1 = Difficult ]
20%20%20%
1
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
20%20%20%
1
Average 20%
looks good! yeah not a DIY for my at least.
Reply With Quote
  #8  
By illrider on 06-13-2012, 03:59 PM
Member reviews
Difficulty [ 1 = Difficult ]
20%20%20%
1
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
20%20%20%
1
Average 20%
Great write up. Wish I had the tools/experience to pull it off. Too bad you aren't local otherwise i'd pay you to make me one for my E90!
Reply With Quote
  #9  
By kiwi29 on 06-13-2012, 04:59 PM
EPIC.
Reply With Quote
  #10  
By Ch3ss on 06-13-2012, 07:05 PM
great diy very helpful. just wondering can you tell us how much you spent on materials.
Reply With Quote
  #11  
By M3Tuner44 on 06-13-2012, 11:11 PM
Member reviews
Difficulty [ 1 = Difficult ]
40%40%40%
2
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
80%80%80%
4
Average 47%
Quote:
Originally Posted by illrider View Post
Great write up. Wish I had the tools/experience to pull it off. Too bad you aren't local otherwise i'd pay you to make me one for my E90!
In the process of possibly making one for another member, I can ship!!
Reply With Quote
  #12  
By taz2ko0 on 06-18-2012, 07:41 AM
Where did you mount the amp?
Reply With Quote
  #13  
By M3Tuner44 on 06-18-2012, 10:25 AM
Member reviews
Difficulty [ 1 = Difficult ]
40%40%40%
2
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
80%80%80%
4
Average 47%
I put the amp right under the decklid. You can't see it unless you duck down and look into the trunk. If you just standing you can't see anything. For only a 250w amp it hits very hard. I have a PAC trunkloc connected to my factory suns so I can adjust the bass for the sub right from the front and don't had to adjust the amp. I have the bass boost on the amp off and the bass completely turned down on the factory settings and it still hits very hard.
Reply With Quote
  #14  
By lightning_x1 on 06-20-2012, 11:03 AM
Member reviews
Difficulty [ 1 = Difficult ]
20%20%20%
1
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
20%20%20%
1
Average 20%
Quote:
Originally Posted by illrider View Post
Great write up. Wish I had the tools/experience to pull it off. Too bad you aren't local otherwise i'd pay you to make me one for my E90!
Very nice work indeed!
Reply With Quote
  #15  
By Delusive on 06-20-2012, 10:36 PM
Great DIY Guide

I was wondering where are you located and will you be taking orders? cuz i'd buy one, maybe two.

I'd do it myself but no tools or garage to work in.
Reply With Quote
  #16  
By M3Tuner44 on 06-20-2012, 10:45 PM
Member reviews
Difficulty [ 1 = Difficult ]
40%40%40%
2
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
80%80%80%
4
Average 47%
Quote:
Originally Posted by JS-NA.E92 View Post
Great DIY Guide

I was wondering where are you located and will you be taking orders? cuz i'd buy one, maybe two.

I'd do it myself but no tools or garage to work in.
I am on Long Island. Yea PM me if interested.
Reply With Quote
  #17  
By onesuperboi on 06-23-2012, 05:31 PM
Awesome bro!

Do you have any more pics of how you wired the sub?
Reply With Quote
  #18  
By Jat_E92 on 06-26-2012, 12:12 PM
Member reviews
Difficulty [ 1 = Difficult ]
20%20%20%
1
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
20%20%20%
1
Average 20%
I've started this too, at the stage of displaying the matle for the sub. Need to go and get a heat gun and some putty tonight and will hopefully have it placed up and puttied. Sanding tomorrow!
Reply With Quote
  #19  
By bootleg on 07-01-2012, 03:34 AM
Ill buy one too if your still willing to make them for e90s
Reply With Quote
  #20  
By Jat_E92 on 07-06-2012, 07:30 AM
Member reviews
Difficulty [ 1 = Difficult ]
20%20%20%
1
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
20%20%20%
1
Average 20%

My effort, slightly different but I am chuffed with it! Can't wait to get it connected this week.
Reply With Quote
  #21  
By Jat_E92 on 07-06-2012, 07:37 AM
Member reviews
Difficulty [ 1 = Difficult ]
20%20%20%
1
Cost [ 1 = Expensive ]
20%20%20%
1
DIY Clarity [ 1 = Not clear ]
20%20%20%
1
Average 20%
I'll try that again
Attached Images
 
Reply With Quote
Comment

Bookmarks

Tutorial Tools Search this Tutorial
Search this Tutorial:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 11:24 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST