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Old 1st October 2004, 07:57 PM   #1
Wagener is offline Wagener  South Africa
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Default enclosure size too big?

What will happen if you use an enclosure that is too big for a sub? I have a 12" subwoofer that I want to use in my home. It is fitted into a sealed box of more that 2.5cuFt.

How will I know whether I need to add some stuff into the box to decrease the volume. Also, what material is best to place inside the box? I do not have TS parameters for the sub.
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Old 1st October 2004, 08:07 PM   #2
Did it Himself
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If the box is too big the bass will be overdamped, i.e. roll off too early and also the excursion limit will be reached with less power.
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Old 1st October 2004, 08:11 PM   #3
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It's difficult to say without knowing more about the driver. In general, increasing the box size results in the driver rolling off sooner but shallower. If the enclosure is far, far too big it will start to act like an infinite baffle. If the driver doesn't have the ability to handle this it will suffer decreased power handling, potentially bottom out and lose a great deal of it's output. Go ahead and try it, might be ok. If you want to decrease interior volume you'll need a dense material (wood, rocks, etc.).
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Old 1st October 2004, 09:47 PM   #4
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Default Size

Actually 2.5 cf is not that big for a 12" sub woofer built for home use. Depends on the VAS. Most take a larger box than that if you want to keep the Q lowish. Look at the Peerless, NHT, and so on.

Try it, first. You might like it.

Tim
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Old 1st October 2004, 09:59 PM   #5
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Quote:
if you want to keep the Q lowish
Yes, I tend to prefer low Q subs. More natural sounding.
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Old 2nd October 2004, 12:32 AM   #6
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Quote:
Originally posted by Timn8ter
It's difficult to say without knowing more about the driver. In general, increasing the box size results in the driver rolling off sooner but shallower. If the enclosure is far, far too big it will start to act like an infinite baffle. If the driver doesn't have the ability to handle this it will suffer decreased power handling, potentially bottom out and lose a great deal of it's output. Go ahead and try it, might be ok. If you want to decrease interior volume you'll need a dense material (wood, rocks, etc.).
How does a driver lose a great deal of its output when used in an infinite baffle?
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