Hey ho. Has anyone experimented with egg cartons to line the enclosure of a sub? I don't mean the plastic ones, but those pressed organic papery ones that have one side looking like anechoic chamber liners.
Regards John
Regards John
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Must be data somewhere?
Cardboard and air trapped behind it combine to do some benefit.
The low bass isn't what's rolling around inside the box.
B.
Cardboard and air trapped behind it combine to do some benefit.
The low bass isn't what's rolling around inside the box.
B.
Are you thinking that with paper being as damped as it is, and... I heard someone recently suggest bubble wrap would do the same thing.
Bubble wrap consists of sealed air pockets, and would only serve to reduce the air volume of an enclosure.
Paper egg boxes are acoustically transparent as far as low frequencies are concerned. LF will just pass straight through any material which has insufficient density.
Even materials such as closed cell acoustic foam and loudspeaker felts are only effective at midrange to high frequencies.
P.S. The closed cell structure of acoustic foam absorbs energy when the cell content, air, is compressed and rarefied due to the sound pressure wave.
This may lead people to believe that the air cells in bubble wrap will allow the material to act as a sound absorber in a similar fashion.
Even materials such as closed cell acoustic foam and loudspeaker felts are only effective at midrange to high frequencies.
P.S. The closed cell structure of acoustic foam absorbs energy when the cell content, air, is compressed and rarefied due to the sound pressure wave.
This may lead people to believe that the air cells in bubble wrap will allow the material to act as a sound absorber in a similar fashion.
This YouTube video is an interesting guy (discussed in other threads) who evaluates various kinds of treatments. Egg cartons don't do much.
DIY Speakers and Acoustic Panels - YouTube
I imagine his methods may not be up to some readers' standards, but I found it generally interesting.
DIY Speakers and Acoustic Panels - YouTube
I imagine his methods may not be up to some readers' standards, but I found it generally interesting.
At bass frequencies, there will be little absorption or diffusion of unwanted reflections. I think that when egg cartons are used as a room treatment, they act more as diffusers than absorbers.
Unless you wanted to consider the pockets as having a couple of properties. Firstly that they are compliant, and that pressure variations would result in no pressure gradient between either side of the pocket, but as a result there will be a change of volume of the bubbles.
And secondly, (and I am yet to see data) that they produce heat, thus making them like little pressure/panel absorbers.
Re: egg cartons
there was a guy on Ulfman's Karlson forum who poked a hole in each "dome" then stuffed each cavity with a tuff of fiberglass. A few years ago there was a custom paper product made pretty much like egg cartons which claimed to give cleaner bass, IIRC, by cleaning up the midrange and not affecting LF.
there was a guy on Ulfman's Karlson forum who poked a hole in each "dome" then stuffed each cavity with a tuff of fiberglass. A few years ago there was a custom paper product made pretty much like egg cartons which claimed to give cleaner bass, IIRC, by cleaning up the midrange and not affecting LF.