why ported and why sealed for a given driver? - Page 4 - diyAudio
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Old 4th March 2014, 10:58 PM   #31
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Basalt mineral wool does not pose the same hazard as glass wool. For every article you find that says it is, I'll find you two that says it isn't
Beside, errant fibres are easy to deal with.
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Old 5th March 2014, 12:48 AM   #32
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I bet those fine particles could find their way through the spider to the voice coil to..

so does the dampening sort of cancel out the springyness of the Air? I'm talking about a plain sealed box, no filling fluff.
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Old 5th March 2014, 12:55 AM   #33
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It's not a matter of cancelling. The force on the cone is the sum of the spring-force due to the box pressure increasing, and the resistive damping force. Adding damping increases the resistive damping force, which lowers Q and makes the system ring less. It does not reduce or cancel out the spring force, it changes the ratio of the two forces.
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Old 5th March 2014, 04:48 AM   #34
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Quote:
Originally Posted by ubza1234 View Post
I bet those fine particles could find their way through the spider to the voice coil to..
I like just having a very thin sheet of felt surrounding the rear of the driver to make sure it's all neat'n'tidy.

I also tried stuffing a t-tqwt with ikea pillows, ended up using a single layer of 2cm thick wool felt in the bottom part, much cleaner sound.
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