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Old 3rd February 2009, 11:05 PM   #1
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Default Volume (size) Question

I am planning to use drivers that require the volume of 0.16 cu ft. (what I calculated) If i decided to put 2 of them in a box, does that mean I need 0.32 cu ft? or does it remain at 0.16?

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Old 3rd February 2009, 11:54 PM   #2
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Depends on how you mount them.

Normally you'd need twice the volume but if you for example coupled cavity mounted them, you'd only need half the volume.
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Old 4th February 2009, 03:27 AM   #3
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I wont be cavity mounting. one will be pointing out towards the listener, the other will be pointing down facing the ground like a sub. the cabinet is sealed, hollow inside.
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Old 4th February 2009, 09:28 PM   #4
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now u got me thinking. what do you mean by cavity? split the cabinet in half with a piece of mdf?
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Old 4th February 2009, 09:57 PM   #5
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Actually I meant it as one driver with the magnet facing out and one with the magnet facing in but mounted on top of eachother in push-pull mode. A search on the internet seems that's not what everybody understands by coupled cavities however. Some seem to think it's another word for a bandpass cabinet, probably because some of the most successfull bandpass cabinets used (what I understand with) coupled cavity connected drivers inside the box.
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Old 5th February 2009, 12:05 AM   #6
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Is it like this....an Isobaric Push-Pull?
_______________________________________________Ric k......
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Old 5th February 2009, 12:21 AM   #7
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well.. what about my 90 degree angle? lol. will my woofer push out my mid's? do I need to build a barrier to stop the pressurization? its a sealed box design..
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Old 5th February 2009, 12:41 AM   #8
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The Isobaric Push-Pull relies on a small 'chamber' of air to work correctly. The drivers in this configuration run the same way, as one goes in the other goes out.
As I illustrate here..Both drivers would have to go "out" at the same time. As a result you might very well be on to something as the drivers may cancell out some non-linearities (Shape of the cone)
Yes of course you will have to 'seal off' your mid-ranges...don't want the pressures inside to 'excite' the mid-range cone.
With this illustration you will have to double the assigned volumes.
Check your numbers again as it sounds like your numbers are WAY too small.
A 12" woofer should get at least 1,1/2 cu. Ft.
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Old 5th February 2009, 12:59 AM   #9
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0.16 cu ft is about 4 litres.. considering my woofer is only 5 inches compared to your example of 12 i think its close? I just plugged it all into the winisd calculator...
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