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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

"airtight", with pinhole?

If you built your cabs airtight, you could then drill a very small hole that would let air flow over long time periods when the barometric pressure changes, but would be too small to allow significant pressure change on the time scale of music. Most pressurization is assocated with low frequencies, so you could aim for some design target like "less than 10% pressure change at a time constant around 1/100Hz = 0.01 sec".

Since air is a Newtonian fluid, the amount of flow can be calculated fairly simply given the diameter and length of the hole.

The fly in the ointment here is that many drivers are themselves leaky...

Peter


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  • "airtight", with pinhole? - PSP 12:32:51 10/31/06 (0)


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