Choice of driver for El Pipe-O

Nicwix · 10th June 2003, 09:12 PM

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 www.passdiy.com

Regards

Nic

stokessd · 10th June 2003, 10:13 PM

Lambda acoustics TD15?

http://lambdacoustics.com

I heard that they are closing their doors though.

Sheldon

planet10 · 11th June 2003, 07:50 AM

Quote:

Originally posted by stokessd
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 · 11th June 2003, 07:01 PM

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 · 11th June 2003, 11:28 PM

Quote:

Originally posted by planet10

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 · 12th June 2003, 12:02 AM

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 · 12th June 2003, 08:57 AM

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 · 14th June 2003, 08:43 AM

Thanks to all who replied ...

Cambe · 1st July 2003, 02:58 PM

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 · 1st July 2003, 03:38 PM

Quote:

Originally posted by Cambe
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

10th June 2003, 09:12 PM	#1
Nicwix diyAudio Member Join Date: Dec 2001 Location: Sydney, Australia	Choice of driver for El Pipe-O 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 www.passdiy.com Regards Nic

12th June 2003, 08:57 AM	#7
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	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. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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10th June 2003, 10:13 PM	#2
stokessd diyAudio Member Join Date: Nov 2002 Location: Fort Wayne, IN	Lambda acoustics TD15? http://lambdacoustics.com I heard that they are closing their doors though. Sheldon

11th June 2003, 07:01 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	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.

12th June 2003, 12:02 AM	#6
KYMcJerry diyAudio Member Join Date: Jan 2003 Location: North Central KY	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

14th June 2003, 08:43 AM	#8
Nicwix diyAudio Member Join Date: Dec 2001 Location: Sydney, Australia	Thanks to all who replied ...

1st July 2003, 02:58 PM	#9
Cambe diyAudio Member Join Date: Aug 2001 Location: USA,NorthCarolina	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

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