Push-pull subwoofers with two drivers

chusso · 5th February 2011, 09:00 AM

Anyone has tryed to make it?? any good suggestions??
2x4ohm drivers in serial was my idea!!

Thanks a lot

Alex

djk · 01:30 PM

Search PPSL, djk

http://i56.photobucket.com/albums/g1...CoePA-2009.jpg

M&K did a common back volume with the drivers on adjacent sides of the box, it got distortion cancellation, but only in the bottom octave.

http://t3.gstatic.com/images?q=tbn:A...KbyW2DtXz8&t=1

Old Audio Pro Ace bass from the late 70s:

http://t1.gstatic.com/images?q=tbn:A...jLIBPiNCUg&t=1

kach22i · 5th February 2011, 01:47 PM

Quote:

Originally Posted by chusso

Anyone has tryed to make it?? any good suggestions??
2x4ohm drivers in serial was my idea!!

Thanks a lot

Alex

For years I planned making (2) 6 inch diameter x 6 foot PVC or stiff cardboard tube bass cannons using 4 inch Radio Shack woofers I've had for 20 years. At one end the driver basket would be inside the tube, the other side the driver basket would be facing outside (wired out of phase).

Never built it, but think there has since been products or kits designed to be positioned behind a couch or hung by wires overhead. I think Bose even makes something like that now.

System Services, Inc. Las Vegas * Nevada (702) 493 - 1163

I purchased a M&K MX-90 push pull subwoofer back in 1994 and still use it. It is a sound design and I've always liked the concept as well as the sound.

Martin Logan / now Paradigm subwoofer uses an interesting layout too.
Martin Logan Descent i & Depth i Subs - Home Theater Forum and Systems - HomeTheaterShack.com

CRESCENDO · 8th February 2011, 06:18 AM

Quote:

Originally Posted by chusso

Anyone has tryed to make it?? any good suggestions??
2x4ohm drivers in serial was my idea!!

Thanks a lot

Alex

What is your goal? Where will these be used? Home theater? Live sound? What amp? How big? What frequencies are you trying to reproduce?

Justin

picowallspeaker · 8th February 2011, 06:37 AM

Don't know if 'serializing' two drivers instead of 'paralleling' them might be worse . If they are also mechanically cross-connected ,like in isobaric p-p ,currents in the VCs would be also 'equalized' due to backEMF and mutual pistonic movement . If the two VCs are not perfectly equal ,one speaker may have slightly different 'activation' time ,so it may be a 'load' for the more efficient one. Am I clear

???

planet10 · 8th February 2011, 07:07 AM

Quote:

Originally Posted by kach22i

Martin Logan / now Paradigm subwoofer uses an interesting layout too.

For the sake of novelty they miss getting the most force cancellation. They are relying on the cabinets to act as force carriers which means the box is taking all the load, and by having 3 instead of 2 or 4 are not using the most effective geometry.

dave

revboden · 10th February 2011, 10:21 PM

This may be a bit obvious... Steve's Compounded, Super-Duper Shiva/Sonotube(R) T-line Subwoofers

5th February 2011, 09:00 AM	#1
chusso diyAudio Member Join Date: Nov 2009	Push-pull subwoofers with two drivers Anyone has tryed to make it?? any good suggestions?? 2x4ohm drivers in serial was my idea!! Thanks a lot Alex

5th February 2011, 01:26 PM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	Search PPSL, djk http://i56.photobucket.com/albums/g1...CoePA-2009.jpg M&K did a common back volume with the drivers on adjacent sides of the box, it got distortion cancellation, but only in the bottom octave. http://t3.gstatic.com/images?q=tbn:A...KbyW2DtXz8&t=1 Old Audio Pro Ace bass from the late 70s: http://t1.gstatic.com/images?q=tbn:A...jLIBPiNCUg&t=1 __________________ Candidates for the Darwin Award should not read this author. Last edited by djk; 5th February 2011 at 01:30 PM.

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8th February 2011, 06:37 AM	#5
picowallspeaker diyAudio Member Join Date: Apr 2007	Don't know if 'serializing' two drivers instead of 'paralleling' them might be worse . If they are also mechanically cross-connected ,like in isobaric p-p ,currents in the VCs would be also 'equalized' due to backEMF and mutual pistonic movement . If the two VCs are not perfectly equal ,one speaker may have slightly different 'activation' time ,so it may be a 'load' for the more efficient one. Am I clear ???

10th February 2011, 10:21 PM	#7
revboden diyAudio Member Join Date: Feb 2011	This may be a bit obvious... Steve's Compounded, Super-Duper Shiva/Sonotube(R) T-line Subwoofers

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