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?
Is this correct?
generally speaking you can pad 4 walls with little effect to the volume so long as it's not the super dense 2inch stuff.
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!
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!
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).
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
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
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.
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
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
hey - well this post certainly helped me. I was wondering the same thing about the vented sub i'm (finally) about to build.
Thanks Audiofreak.
David.
Thanks Audiofreak.
David.
Dave,
Please note that as I stated above, my earlier comments are only valid for sealed enclosures. Glad I could help.
Please note that as I stated above, my earlier comments are only valid for sealed enclosures. Glad I could help.
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