Choice of driver for El Pipe-O

[Nicwix]

Can anyone provide info on selection of a driver for El Pipe-O, especially what parameters are critical, how to determine pipe size, etc.

In particular, would a 12" car subwoofer work well in this design

I see there is some (but not much) discussion in El Pipe-O is up at [url]www.passdiy.com[/URL]

Regards

Nic

 

[stokessd]

Lambda acoustics TD15?

http://lambdacoustics.com

I heard that they are closing their doors though.

Sheldon

 

[planet10]

I heard that they are closing their doors though.

Nice drivers, those lambdas -- they are not going out of business, just mutating so they can survive.

Idealy you would like a driver with 0.5<Qt<1.0. And the bigger the Vas of the driver, the bigger the pipe you will need for optimum performance (el pipo would perform better with a larger pipe than it has...)

dave

 

[Nelson Pass]

It's been my experience that just about any decent woofer
will do a good job in a pipe-line. I recommend a pipe with a
diameter similar to the cone, and a length about the 1/4
wavelength of the resonance of the woofer.

 

[stokessd]

Nice drivers, those lambdas -- they are not going out of business, just mutating so they can survive.

I ordered a set of the TD15S-LE drivers before the price increase, and I wasn't impressed. I'll take a peerless XLS over them.

One was damaged in shipment and I've had a heaping helping of really bad customer service from them. I just mailed them back last week for a refund.

Sheldon

 

[KYMcJerry]

Hello,

I think the Adire Audio Malstrom 18" sub would be great in his design if you just use one coil on each woofer to pull up the Qt. It has tons of displacement.

Thanks,

mcJerry

 

[pinkmouse]

The good thing about any driver with dual voice coils, is that by putting a 10W variable resistor across the other VC, you can tune the Qts to whatever you want as the VC shorted across the pot acts as a EMF brake, damping the speaker.

 

[Nicwix]

Thanks to all who replied ...

 

[Cambe]

Hello Everyone,
I have some questions concerning drivers for use in a EL Pipe-O.I
am planning to use 4- Dayton Quatro 8's. Parts Express #295-545
in a compound push- pull set-up. I am trying to figure out the enclosure vb (.80 or .40 ), PVC pipe 8" dia. 30" long and stuffed at
.785 lbs/ft3.Does this sound right?
Sincerely,
Cambe

 

[planet10]

PVC pipe 8" dia. 30" long and stuffed at
.785 lbs/ft3.Does this sound right?

Even with only 1 driver per pipe, your line sounds awefully small.

Martin King has just released his 1st alignment tables. You could use these to get a more optimum el pipe-o. http://www.quarter-wave.com/

dave

 

[Cambe]

Hello Dave,
The numbers I gave came from using Larry Sharp's Q&ETLD software.I would like to use Mr. King's software if I could only understand how to use it and Mathcad.
Cambe

 

[Cambe]

I went to MJK's web-site and tried to view the tables you mentioned and wasn't able to view them. My computer kept informing me of errors in view the pdf's pages.
Sincerely,
Cambe🙁

 

[planet10]

I went to MJK's web-site and tried to view the tables you mentioned and wasn't able to view them. My computer kept informing me of errors in view the pdf's pages.

Turn off the plug-in in your browser and just download the pdf... the web server he is on may not support viewing of a pdf inside your browser.

dave

 

[Cambe]

I tried and still wasn't able to see anything but Martin's name and
address.
Thanks,
Cambe

 

[MJK]

Some of the "pdf" files are quite large. The download time can be 15 - 30 minutes depending on which file you select. If you try letting the download continue for a longer period of time and still have no luck please let me know which file you are interested in and I will e-mail it directly.

Hope that helps,