Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

How to fold a TQWP?
How to fold a TQWP?
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 8th February 2004, 11:38 PM   #1
JC Fardo is offline JC Fardo  Brazil
diyAudio Member
 
JC Fardo's Avatar
 
Join Date: Jun 2002
Location: Sao Paulo - Brazil
Default How to fold a TQWP?

Hi

I´ve just got data form MJK worksheets for a ML TQWP and the first graphics are pretty much satisfying. Resulting line lenght is 72 in., So= 0.5 and Sl= 3Sd, driver offset is 0.5. Driver is a Vifa PL18

My doubt is how to draw a folded line and how to get the effective lenght in the area the line folds behind the woofer?

My box project is similar to this one found in fellow Jim Read pages:

http://www.jrbham.btinternet.co.uk/tqwp/index.html

In advance thanks for comments

JC
  Reply With Quote
Old 9th February 2004, 12:38 AM   #2
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
How to fold a TQWP?
Here is a design example...

http://www.t-linespeakers.org/FALL/bipolar/index.html

and i believe Bob Brines has a folded & non-folded vesion of his 1354 ML-TQWT (link on the page above)

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 9th February 2004, 11:04 AM   #3
JC Fardo is offline JC Fardo  Brazil
diyAudio Member
 
JC Fardo's Avatar
 
Join Date: Jun 2002
Location: Sao Paulo - Brazil
Hi Dave

Yes, this is a good example. Regarding the blue drawing, the LINE LENGHT "path" starts in the midle of small section and follows all trough the increasing section up to midle of large section?

And in this example offset is near 0.5?

Bob has deleted the folded TQWP from his page.

TIA, JC
  Reply With Quote
Old 9th February 2004, 03:27 PM   #4
Bob Brines is offline Bob Brines  United States
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Nope, it's still there. Go to my site http://www.geocities.com/rbrines1/ and click on "Straight Pipe" in the left hand column. The folded version is at the bottom of the page.

Bob
  Reply With Quote
Old 9th February 2004, 05:18 PM   #5
JC Fardo is offline JC Fardo  Brazil
diyAudio Member
 
JC Fardo's Avatar
 
Join Date: Jun 2002
Location: Sao Paulo - Brazil
Hi Bob

OK, that´s fine. Now, how did you get the inner dimensions of the folded version to result 60 in. from the Straight Pipe.

There´s a straigh 30in. segment (botton to woofer), plus R5 and 22.5in. to the throat.

Then, 30 + (2.5*pi) + 22.5 = 60.35.

Sorry being so primary. I´m in novice ranking. Please correct me

TIA
JC
  Reply With Quote
Old 9th February 2004, 06:13 PM   #6
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
How to fold a TQWP?
Quote:
Originally posted by JC Fardo
Regarding the blue drawing, the LINE LENGHT "path" starts in the midle of small section and follows all trough the increasing section up to midle of large section?

And in this example offset is near 0.5?
Yes.

The driver is exactly at 0.5... middle of the fold.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote

Reply


How to fold a TQWP?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Three fold BIB? G Full Range 4 13th April 2007 05:52 PM
can you fold HF horns? Puggie Multi-Way 6 10th April 2006 10:49 AM
Help me un-fold Mindstorm Tuliman Multi-Way 4 9th April 2006 05:43 PM


New To Site? Need Help?

All times are GMT. The time now is 08:00 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki