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Old 30th November 2001, 08:25 PM   #1
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Correct me if i am wrong but if you are using that 'egg crate' foam as damping material you dont need to account for it's volume displacement when working out the size of the speaker enclosure.

Is this correct?
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Old 1st December 2001, 08:10 AM   #2
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That's correct, unless you have very much of it.

Janne
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Old 13th January 2002, 11:12 AM   #3
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Default Define

Please define 'a lot of it'... On every wall, one layer?
Thanks.
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Old 13th January 2002, 11:20 AM   #4
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generally speaking you can pad 4 walls with little effect to the volume so long as it's not the super dense 2inch stuff.
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Old 13th January 2002, 11:25 AM   #5
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Default acoustic foam

It is the 1 1/2 inch convoluted acoustic foam from parts express. The box is 20x20x21.5" internal dimensions, the optimum size using WinISD, so putting a layer on all the walls will not affect the volume. Therefore it is 4.63 ft cubed, correct?
Thanks a lot!
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Old 13th January 2002, 11:39 AM   #6
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give me 1/2 an hour and i'll check it out for you.
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Old 13th January 2002, 12:19 PM   #7
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you'll most likely find you need to decrease the volume of the enclosure by about 10% and you should only apply the foam to the rear, both sides and top or bottom (but not both).
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Old 13th January 2002, 02:08 PM   #8
Geoff is offline Geoff  United Kingdom
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AudioFreak

What is the point in starting a new thread with a question to which you apparently already know the answer?

Not only have you answered your own question, but you have also replied to tranzistor as if you were proficient in the subject.

So far as the effects of adding a lining to enclosure walls are concerned, a lot depends on the type of enclosure (ie closed box, ported, equalized sub or whatever). You did not seek to ascertain this essential information before replying to tranzistor therefore your response should have been qualified with an indication of under which circumstances you believe it to be true.

Geoff
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Old 13th January 2002, 02:28 PM   #9
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Geoff at the time that I started this thread i was unsure of the effects of filling ... time has past and i now have a reasonably firm understanding of the topic. And yes i should have asked the enclosure type ... i was assuming sealed if this is not the case the effects may/will be completely different. I do not pretend to be an expert @ any of this ... i just try to help people where and when i can given the experiences i have had.
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Old 13th January 2002, 02:47 PM   #10
Geoff is offline Geoff  United Kingdom
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AudioFreak

My apologies, I hadn't noticed that you started this thread 6 weeks ago. With so many new posts coming in these days I lose track of what is new and what isn't.

Geoff
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