enclosure size too big?

Wagener · 1st October 2004, 08:57 PM

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.

richie00boy · 1st October 2004, 09:07 PM

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.

Timn8ter · 1st October 2004, 09:11 PM

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.).

Tim Moorman · 1st October 2004, 10:47 PM

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

Timn8ter · 1st October 2004, 10:59 PM

Quote:

if you want to keep the Q lowish

Yes, I tend to prefer low Q subs. More natural sounding.

454Casull · 2nd October 2004, 01:32 AM

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?

1st October 2004, 08:57 PM	#1
Wagener diyAudio Member Join Date: Mar 2004 Location: Paarl	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.

1st October 2004, 10:47 PM	#4
Tim Moorman diyAudio Member Join Date: Nov 2002 Location: Indiana	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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1st October 2004, 09:07 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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.

1st October 2004, 09:11 PM	#3
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	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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