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Old 02-27-2009, 08:57 AM
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Default Aperiodic Enclosure Anybody build these?

I am just curious if anyone had any experience with these type of enclosures.

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Very small boxes that "breathe" through a moving membrane. Both the membrane and cone can not be in the same exterior space. Either the membrane part has to be isolated by cutting a hole in the car so that it is outside, or the subwoofer has to be isolated from the rest of the trunk in a similar fashion to free air woofers. The "box" has to be as small as possible (ideally the membrane should be right up against the sub), since it is used only for coupling the sub and membrane. Aperiodic membrane configurations are very hard to design and tune, but give good frequency response and respond faster to transients, giving accurate and tight bass as opposed to boomy sound. They are not ruled by Thiele-Small parameters like other designs, so any woofer would work with the membrane.

If anyone has designed/used an Aperiodic Enclosure, any tips on construction would be very helpful. I am considering this type of enclosure due to very limited space. I know the con, complexity, and pro, transient response.
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Old 02-27-2009, 10:13 AM
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Maybe an isobaric would be easyer?
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Old 02-27-2009, 10:20 AM
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I have never tried one, but it seems like it would be similar to an IB in terms of the install work that needs to be done and then just add a box that fits around the motor and basket and add the membrane.

I'm pretty sure Parts Express sells the membrane if you can't find it elsewhere.
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Old 02-27-2009, 10:22 AM
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Quote:
Originally Posted by rollerdj View Post
Maybe an isobaric would be easyer?
With a name like c3 customs when are you run of the mill... I will look into part's express and see what I can find, thanks...
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Old 02-27-2009, 10:36 AM
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friend of mine use to build these back in the day. sounded good back then but its hard to remember
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Old 02-27-2009, 10:36 AM
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PE has aperiodic vents.
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Old 02-27-2009, 02:54 PM
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Interesting product, to bad there isn't more specifics on it.
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Old 02-27-2009, 03:03 PM
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its been being done since the early 90's
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Old 02-27-2009, 03:45 PM
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don't you need specs on the vents?
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Old 02-27-2009, 03:51 PM
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No, calculate your box for aperiodic loading based on the driver and use the number of vents recommended for your enclosure size.
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