Folded N monopole questions

[ramiro77]

Hi everyone!
I was wondering if there is any method to calculate folded n monopole designs like this:

I´m thinking about build some like that with very cheap fullrange drivers. It will be for my workshop, so I don´t looking for awesome quality, but at least something listenable. But I don´t know how to calculate that kind of enclosures.

 

[planet10]

Martin King worksheets.

dave

 

[ramiro77]

I´m sorry Dave, but i can´t find that worksheets. I only found his web site (well, I assume that it´s his web site), but I didn´t find anything about this kind of enclosures.
Also I tried searching in Google without any success.

 

[planet10]

Quarter Wavelength Loudspeaker Design

The sheets cost $25 (AFAIK) for private use. Somewhere on the site it will tell you how to order.

dave

 

[ramiro77]

Yes, that´s the page I´ve found earlier.
Thanks Dave! I´ll see how to order, but unless he works with bank deposit in cash, I´ll not able to order (because I don´t have credit card).
Meanwhile, I´ll wait for more information about this kind of enclosures.

 

[Scottmoose]

If it's vented, then it's just a folded MLTL. If it's sealed, it's just a sealed pipe of x cross section.

 

[planet10]

That drawing is of the folded diyA ref FR FE127e ML-TL.

dave