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Opposed Subwoofer Design
#389316 02/06/13 09:48 PM
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INANE Offline OP
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Curious what folks/Axiom think about opposed subwoofer design in general. Where you have two drivers in a single box on opposite sides of each other.

Re: Opposed Subwoofer Design
INANE #389321 02/06/13 11:43 PM
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Ummmm....They're opposed?


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
Re: Opposed Subwoofer Design
MarkSJohnson #389323 02/07/13 12:57 AM
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The Seaton submersive is thought by many to be one of the best subwoofers available at any price. It's dual opposed.

Last edited by turbo16v; 02/07/13 01:00 AM.
Re: Opposed Subwoofer Design
INANE #389326 02/07/13 01:08 AM
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I heard an Epik Empire once, crazy performance. Almost got a few of them over Axiom, will always wonder.

http://www.epiksubwoofers.com/products.html


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB SonyUBPX800


Re: Opposed Subwoofer Design
INANE #389331 02/07/13 02:15 AM
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Wasn't the original Audiobytes sub an opposed driver system?


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70
Re: Opposed Subwoofer Design
jakewash #389336 02/07/13 03:09 AM
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Nope. The original Audiobyte sub (EPZero, which I have) is an isobaric sub.


I can explain it to you but I can't understand it for you.
Re: Opposed Subwoofer Design
INANE #389338 02/07/13 03:44 AM
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The design works just fine. I'm not sure that physics backs up the claim of vibration cancellation. I've heard it keeps the sub from jumping around if you are using two monster 18" drivers. grin


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: Opposed Subwoofer Design
fredk #389342 02/07/13 10:16 AM
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Originally Posted By: fredk
I've heard it keeps the sub from jumping around

What if I WANT them to
Jump around
Jump around
Jump around
Jump up Jump up and get down?


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
Re: Opposed Subwoofer Design
INANE #389496 02/09/13 05:06 PM
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Originally Posted By: INANE
Curious what folks/Axiom think about opposed subwoofer design in general. Where you have two drivers in a single box on opposite sides of each other.


Ah...a topic near and dear to my heart. If I am not mistaken, Mirage produced the first commercial subwoofer with an opposed woofer design with the drivers operated in phase with one another. This first model was the BPSS-210 and was originally designed for use in systems with the first Mirage bipolar speakers, the M-1 and M-3. This was in the very early days of home theatre and most of the original subs were sold with 2-channel systems. The design benefits behind opposed driver subwoofers are improved room loading from the multiple drivers and an almost complete cancellation of cabinet vibration. These designs are not gimmicks, they most certainly result in improved performance when well designed. I believe the main reason that we don't see more of them on the market is that the second (or third) driver(s) add significantly to the cost. One thing to watch are designs claiming to have force cancelling drivers where one driver is actually a passive radiator. In this case there will be no benefit in terms of reducing cabinet vibration. Interestingly enough, as Ian and I have been working on design ideas for the "v4" series of subwoofers we have been discussing the possibility of one or two models incorporating a balanced or force cancelling driver configuration. As with everything we do the designs would be evaluated strictly based on their performance versus the current models. Now is as good a time as any to throw the question out there: Is this type of design something that would interest you? wink

Re: Opposed Subwoofer Design
Andrew #389500 02/09/13 06:27 PM
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Originally Posted By: Andrew
Originally Posted By: INANE
Curious what folks/Axiom think about opposed subwoofer design in general. Where you have two drivers in a single box on opposite sides of each other.


Ah...a topic near and dear to my heart. If I am not mistaken, Mirage produced the first commercial subwoofer with an opposed woofer design with the drivers operated in phase with one another. This first model was the BPSS-210 and was originally designed for use in systems with the first Mirage bipolar speakers, the M-1 and M-3. This was in the very early days of home theatre and most of the original subs were sold with 2-channel systems. The design benefits behind opposed driver subwoofers are improved room loading from the multiple drivers and an almost complete cancellation of cabinet vibration. These designs are not gimmicks, they most certainly result in improved performance when well designed. I believe the main reason that we don't see more of them on the market is that the second (or third) driver(s) add significantly to the cost. One thing to watch are designs claiming to have force cancelling drivers where one driver is actually a passive radiator. In this case there will be no benefit in terms of reducing cabinet vibration. Interestingly enough, as Ian and I have been working on design ideas for the "v4" series of subwoofers we have been discussing the possibility of one or two models incorporating a balanced or force cancelling driver configuration. As with everything we do the designs would be evaluated strictly based on their performance versus the current models. Now is as good a time as any to throw the question out there: Is this type of design something that would interest you? wink


Thanks Andrew for sharing a bit more about what you and Ian are currently considering for the v4 subs!

I for one am very interested in the new designs. I need a new sub now more than any other component! So how would a dual opposed sub be better than an EP800? Would it cost more?

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