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What's the simple science behind polyfill stuffing? My explanation as well.
What's the simple science behind polyfill stuffing? My explanation as well.
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Old 21st January 2017, 10:42 PM   #11
PB2 is offline PB2  United States
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Quote:
Originally Posted by nicasiox2 View Post
I think that the polyfill affects so bad the high frequency waves, trapping and dissipating them, letting alive only the low frequencies. So now because low frequencies have no more competition, they have a more pure process of creation and evolution, resulting the enclosure in an improved bass machine that creates stronger low waves.
That's clear as mud, let me add a bit more:
"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum"
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Old 22nd January 2017, 12:41 AM   #12
tb46 is offline tb46  United States
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Hi PB2,

Post #11: "...clear as mud..."

Luckily, bjorno posted a link to a great article on the subject in Post #10. That ought to cover the ground... :-)

Regards,
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Old 22nd January 2017, 03:51 AM   #13
anatech is offline anatech  Canada
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What's the simple science behind polyfill stuffing? My explanation as well.
Hi Pete,
Please post in English or provide an English translation for the rest of us.

Filler, okay.

-Chris
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Old 22nd January 2017, 01:10 PM   #14
Ron E is offline Ron E  United States
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Quote:
Originally Posted by PB2 View Post
That's clear as mud, let me add a bit more:
https://en.wikipedia.org/wiki/Four_stages_of_competence
The better response to someone at lower stages is to teach them, not to deride.

For those who aren't familiar, the "Lorem ipsum..." is nonsensical filler text used in developing a format for a document so that viewers will focus on format rather than content.
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Old 22nd January 2017, 01:40 PM   #15
Joel Wesseling is offline Joel Wesseling  Canada
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http://www.kirchner-elektronik.de/~k...evelopment.pdf

Starting on Page 50(W5.3)

Studying the enclosure lately - Thought this might add something to the topic here.
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Old 31st January 2017, 12:08 AM   #16
zettairyouiki is offline zettairyouiki  United States
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As bjorno has linked, the relation between apparent box size and stuffing is a known mechanism. If you have no stuffing, the air in the box compresses adiabatically where p(v^1.4)=c and the air heats and cools slightly during compression and expansion.
Adding stuffing at the critical amount gives a large amount of surface area for the air to transfer heat to, making it an isothermal process that behaves with pv=c.
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Old 31st January 2017, 06:40 AM   #17
QSerraTico_Tico is offline QSerraTico_Tico  Europe
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Default Acoustical Resistance

If I remember well from the Olson book stuffing acts as an acoustical resistance.....
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Old 31st January 2017, 07:50 PM   #18
Andersonix is offline Andersonix  Sweden
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What's the simple science behind polyfill stuffing? My explanation as well.
Stuffing is good, but polyester fibers are the worst material according to tests done by a German magazine.
Attached Images
File Type: png Box stuffing fig1.png (316.9 KB, 109 views)
File Type: png Box stuffing fig2.png (187.4 KB, 105 views)
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Old 1st February 2017, 04:43 PM   #19
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Andersonix View Post
... but polyester fibers are the worst material according to tests done by a German magazine.
Hi Andersonix,

Disagree..The Text and Questions made are inconclusive for someone that work with Damping Materials Daily.

b
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File Type: jpg absorbers1.jpg (882.4 KB, 83 views)
File Type: jpg absorbers2.JPG (822.8 KB, 82 views)
File Type: jpg absorbers3.JPG (888.1 KB, 76 views)
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Old 1st February 2017, 07:34 PM   #20
Andersonix is offline Andersonix  Sweden
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What's the simple science behind polyfill stuffing? My explanation as well.
You got me with tortuosity...
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