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Old 6th November 2008, 05:02 AM   #1
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Default Opposed drivers

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...
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Old 6th November 2008, 05:51 AM   #2
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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
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Old 6th November 2008, 06:02 AM   #3
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Default 2 X 18" Selenium

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Old 6th November 2008, 06:03 AM   #4
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Default Drivers are not push-pull, they are wired in Phase

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Old 6th November 2008, 06:05 AM   #5
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Old 6th November 2008, 06:08 AM   #6
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Default 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.
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Old 6th November 2008, 06:21 AM   #7
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My ApexJr Super 8 push-push woofer

dave
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Old 6th November 2008, 06:24 AM   #8
doorman is offline doorman  Canada
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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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Old 6th November 2008, 06:25 AM   #9
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Here is a visualization of a box for a pair of CSS SD12
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Old 6th November 2008, 06:28 AM   #10
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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
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