E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > Bavarian Soundwerks' Mobile Electronics Forum

Bavarian Soundwerks' Mobile Electronics Forum
Have all your A/V and electronics questions answered here. Ipods, A/V, Radar Detectors Oh My!
Sponsored by Bavarian Soundwerks

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 11-01-2008, 02:42 PM   #1
bigjae1976
Registered User
 
bigjae1976's Avatar
 
Join Date: Dec 2003
Location: Earth
Posts: 11,420
My Ride: A car
Send a message via MSN to bigjae1976
How to calculate a slot ported box

Here is how to build a simple slot ported box with 1 90 degree bend. First, determine the ideal specs of the sub. I wouldn't use modeling programs. The best info will come directly from the manufacturer's tech dept. They should have a LOT of experience with the sub in different size boxes and tuning freqs.

Net internal volume. You need to know if this accounts for the sub itself which becomes important in smaller boxes since the speaker accounts for a more significant % of the gross int volume.

Tuning Frequency. Expressed in Hz. Usually you want to keep in the low 30's (30hz-35hz) but the best freq will be determined by the sub and the listener's preferences.

First, determine the port area needed. General rule is 12-16 sq in per cu ft of int volume to avoid port noise. So if you have a 1.5 cu ft net int volume box, you would want 18-24 sq in of port area.

Here is a link to help you out.

http://www.carstereo.com/help2/Articles.cfm?id=31

Once you know what your target range is for port area, then start plugging in the numbers in the link below.

http://reaudio.com/speaker_box/LPort_Box_Calc.html

Basically, just play with the red numbers until the box volume (ft3) and Tuned Frequency (Fb) are real close to the spec for the sub. Its trial and error.

Below, you'll get all of the required cuts to build your box.

JUST MAKE SURE YOU HAVE ENOUGH ROOM TO MOUNT THE SPEAKER! If you are building a box for a 12" sub and all of your dimensions are 10", it won't work.

Also keep in mind that the side 2 of the port might run behind the speaker mounting location. Make sure you have enough mounting depth when you take the port width into account.
bigjae1976 is online now   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 12-19-2009, 04:49 PM   #2
RideZERO6866
Registered User
 
Join Date: Apr 2009
Location: Rockledge, Florida
Posts: 10
My Ride: 2002 330ci
I used this (http://reaudio.com/speaker_box/LPort_Box_Calc.html) program to build a box for my 330ci and the box is huge. I managed to get 1.7 cu feet per 12" speaker and 2 12s tuned to 27hz which is what i guess the type rs are supposed to be tuned to and let me tell you this HUGE DIFFERENCE!!! It was day and night. Thanks for the info about the box setup bigjae1976. All I need now is some sound dampening to get what i paid for out of the system.
RideZERO6866 is offline   Reply With Quote
Old 12-19-2009, 06:02 PM   #3
bigjae1976
Registered User
 
bigjae1976's Avatar
 
Join Date: Dec 2003
Location: Earth
Posts: 11,420
My Ride: A car
Send a message via MSN to bigjae1976
Glad to hear it worked out for you.
bigjae1976 is online now   Reply With Quote
Old 01-03-2010, 02:51 PM   #4
maxi
Registered User
 
Join Date: Apr 2006
Location: Qatif -Awamiah
Posts: 362
My Ride: BMW E46 328I, 1999
I was folowing the instruction in this site
http://www.bcae1.com/spboxnew2.htm

, I use the encloser box for sub. and it gives me a great sound even with stock head unit. I cant imagin the sound if I'm using after market head unit?!.
__________________
http://forum.e46fanatics.com/signaturepics/sigpic64570_1.gif
maxi is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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 On
Censor is ON





All times are GMT -5. The time now is 06:52 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use