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-   -   How to fold a TQWP? (http://www.diyaudio.com/forums/multi-way/27830-how-fold-tqwp.html)

JC Fardo 8th February 2004 10:38 PM

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

planet10 8th February 2004 11:38 PM

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

JC Fardo 9th February 2004 10:04 AM

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

Bob Brines 9th February 2004 02:27 PM

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

JC Fardo 9th February 2004 04:18 PM

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

planet10 9th February 2004 05:13 PM

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


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