Opposed drivers

Cloth Ears · 6th November 2008, 05:02 AM

If I was to build a subwoofer like this, with the 2 drivers facing each other and wired in phase, what would be the effects? Would I be getting cancellation, or would I just be getting an increase in SPL due to the 2 drivers?

Yes, it would be big, but it's just a head exercise at the moment...

planet10 · 6th November 2008, 05:51 AM

Better and prettier if the magnets are inside the box and physically connected. Reactive forces are actively cancelled.

This is a push-push woofer. We've built many.

dave

Workhorse · 6th November 2008, 06:02 AM

Workhorse · 6th November 2008, 06:03 AM

Workhorse · 6th November 2008, 06:05 AM

Workhorse · 6th November 2008, 06:08 AM

IN PHASE wiring helps in achieving high SPL and no cancellation takes place.

With 4KW of active drive amp, one cannot stand in front of this Bass Engine, the vibration and blast is so Hard hitting that the chest feels a Heavy Punch.

planet10 · 6th November 2008, 06:21 AM

My ApexJr Super 8 push-push woofer

dave

doorman · 6th November 2008, 06:24 AM

I have built the Apex Jr. sub (thanks, Dave!) It mates wonderfully with my Frugel Horns (big thanks to Dave, et al!)
Don

planet10 · 6th November 2008, 06:25 AM

Here is a visualization of a box for a pair of CSS SD12

planet10 · 6th November 2008, 06:28 AM

And taking the idea one step further a concept for a push-pull-push-push isobarik woofer )net volume required is the same as for a single driver -- the torus spape an easy way to hide the magnets.

dave

6th November 2008, 05:51 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Better and prettier if the magnets are inside the box and physically connected. Reactive forces are actively cancelled. This is a push-push woofer. We've built many. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

6th November 2008, 06:02 AM	#3
Workhorse diyAudio Member Join Date: Dec 2004	2 X 18" Selenium __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

6th November 2008, 06:03 AM	#4
Workhorse diyAudio Member Join Date: Dec 2004	Drivers are not push-pull, they are wired in Phase __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

6th November 2008, 06:05 AM	#5
Workhorse diyAudio Member Join Date: Dec 2004	Active powered by 4kW Class-H Mosfet Amp __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

6th November 2008, 06:08 AM	#6
Workhorse diyAudio Member Join Date: Dec 2004	The Bass Bin is a Cannon blasting the LF with long throw IN PHASE wiring helps in achieving high SPL and no cancellation takes place. With 4KW of active drive amp, one cannot stand in front of this Bass Engine, the vibration and blast is so Hard hitting that the chest feels a Heavy Punch. __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance


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6th November 2008, 06:24 AM	#8
doorman diyAudio Member Join Date: Jul 2003 Location: Vancouver Isl. B.C.	I have built the Apex Jr. sub (thanks, Dave!) It mates wonderfully with my Frugel Horns (big thanks to Dave, et al!) Don

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