MJK worksheets vs port location - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 9th March 2009, 11:22 AM   #1
diyAudio Member
 
Join Date: Mar 2004
Location: Texas
Default MJK worksheets vs port location

I was working with the ML-TQWT worksheet and something just occurred to me.

For the sake of argument, let's say that the driver is 25% from the "top" of the box and the center of the port opening is 4 inches (100mm) from the "bottom" of the box.

Also for the sake of argument let's say that the length of the port tube causes a 90 degree bend in the tube. Let's make the tube long enough so the the tube opening on the inside of the box is near the driver.

Would this mean that the driver is now acoustically at the "bottom" of the box instead of the top? Or does it not matter at all where the end of the tube is inside the box?
__________________
Any technology sufficiently advanced is indistinguishable from magic
  Reply With Quote
Old 9th March 2009, 11:33 AM   #2
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
The initial part of the worksheets assume you are defining the internal location of the vent.
  Reply With Quote
Old 9th March 2009, 12:32 PM   #3
diyAudio Member
 
Join Date: Mar 2004
Location: Texas
So... if you needed a long tube where would you locate the end?
__________________
Any technology sufficiently advanced is indistinguishable from magic
  Reply With Quote
Old 9th March 2009, 12:35 PM   #4
MJK is offline MJK  United States
Account disabled at member's request
 
Join Date: Feb 2002
Location: Clifton Park, NY
The driver is still at the 25% location. If the port tube extends up almost to the driver then the port tube is also close to the 25% location. The entrance to the port tube is the important variable in the model of the air in the box, the first part of the worksheet. In the second part of the worksheet, the port tube exit is the important variable.

Hope that helps,
  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
Port Location ERICSPEEd Multi-Way 4 3rd December 2008 10:50 AM
Port location andy2 Multi-Way 1 17th October 2005 10:20 PM
port location on linearrays justinc Multi-Way 16 26th April 2005 03:18 PM
MJK worksheets – rectangular port help sunil Multi-Way 3 5th February 2005 08:58 PM
port location? joe_daddy Car Audio 4 18th August 2004 01:38 PM


New To Site? Need Help?

All times are GMT. The time now is 02:33 PM.


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