I need help building a port for a woofer box! - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd January 2012, 03:30 PM   #1
diyAudio Member
 
HassanZia's Avatar
 
Join Date: Jan 2012
Location: Rawalpindi
Unhappy I need help building a port for a woofer box!

Hey!
I have a 8" 50W woofer with 8ohm impedance n i've build a box with 17.6" height, 13.5" width and 13" base. I used chipboard of 2cm thickness. I wanna know the port size. Currently I've made a port of 1" height and 1.2" gap from the back. It's not L port just one piece of 10.7" x 11.7". I'm not satisfied with it coz it doesn't sounds good n no air comes out either but when i remove the tweeter, that hole of 2.5" diameter act as a good port but i dnt want round port i want square port as i build.
If sm1 can help me with this plz pvt me or reply here coz im new to this site n dnt know around.
Plz I really need help!

Peace!
  Reply With Quote
Old 3rd January 2012, 06:27 PM   #2
diyAudio Member
 
Join Date: Jan 2008
This site would help to find out what your box is tuned to:
Speaker Enclosure Volume Calculator

In general, tuning the box (Fb) below the driver's Fs won't give much output.
I don't understand your port description, but it sounds like it may just be tuned too low for the speaker.

Without speaker parameters, hard to give any more useful advice.
  Reply With Quote
Old 4th January 2012, 05:54 AM   #3
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
The numbers do not quite work out, but it appears the cab is tuned to around 43 Hz, so I'm guessing that either there is a leak to keep the vent from working and/or the driver has a much higher Fs.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 4th January 2012, 07:10 AM   #4
diyAudio Member
 
HassanZia's Avatar
 
Join Date: Jan 2012
Location: Rawalpindi
Default Hmmm

Thanks u both it was actually a quite help
As im new to this stuff. I just made that square port without any research so when I used the tweeter hole as a port it went like it was ment to be. I dnt like round ports but I guess I have no solution left....
The website u gave me said port length = 6.064 n dia = 2.216
  Reply With Quote
Old 4th January 2012, 10:08 AM   #5
mdocod is offline mdocod  United States
diyAudio Member
 
Join Date: Dec 2011
Location: Black Forest, CO
Send a message via AIM to mdocod
More than likely when you use the tweeter hole as a port, you are getting a very hefty spike in the upper bass range. Some would call that a one-note-wonder sort of build. Typical of many car sub designs.

I come up with ~45hz tuning... Whether or not your driver will work with that box size and tuning frequency well is entirely unknown without more details about the driver.

Do you know what driver this is? T/S parameters?
  Reply With Quote
Old 4th January 2012, 10:52 AM   #6
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
If you can find out more info on the driver that would be the best, if not take some pics.

A 8" car woofer can work in a really small box.

I'm a fan of 8" woofers, car and HT. I was on a roll for a while, cranked out a bunch of them. The tall black one has been sitting around for a while now, never used.
Attached Images
File Type: jpg Car8s.JPG (204.9 KB, 83 views)
File Type: jpg 3RFs.JPG (621.8 KB, 85 views)
  Reply With Quote
Old 4th January 2012, 01:43 PM   #7
diyAudio Member
 
HassanZia's Avatar
 
Join Date: Jan 2012
Location: Rawalpindi
Cool OK

Here is the picture but all I know is its 8" 50W and 8ohm...
Click the image to open in full size.Click the image to open in full size.
  Reply With Quote
Old 4th January 2012, 08:07 PM   #8
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
Default My two cents:

If you want to get the most out that woofer, make a adapter and mount it to the car's speaker deck, e.g. one of the 6" x 9" hole(s). The trunk will be cabinet.
  Reply With Quote
Old 4th January 2012, 08:44 PM   #9
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
With no specs, a large sealed cab as suggested is your best option, though you can try and get the specs or at least some box design suggestions from the manufacturer: info@styline.org

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 5th January 2012, 10:48 AM   #10
diyAudio Member
 
HassanZia's Avatar
 
Join Date: Jan 2012
Location: Rawalpindi
I've mailed em @GM but they haven't replied dnt know y.....
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Woofer and port position DragonMaster Multi-Way 2 13th September 2008 10:18 PM
Port outside the box?? quickshift Subwoofers 3 24th November 2005 01:37 PM
Port Directly behind woofer noodle_snacks Subwoofers 3 14th October 2005 01:00 PM
help building box for a boschmann 10" ZX102XPRO woofer charlyiy Car Audio 3 25th July 2004 05:29 PM
need a sub box port Jobe Parts 3 26th February 2004 07:19 AM


New To Site? Need Help?

All times are GMT. The time now is 12:23 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2