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<blockquote data-quote="bladebarrier" data-source="post: 5191874" data-attributes="member: 603808"><a href="http://www.bcae1.com/spboxad1.htm" target="_blank">http://www.bcae1.com/spboxad1.htm</a>If you scroll to the very last graph in the above link, you&#039;ll find a visual respresentation of the difference fill makes for a particular example. As you can see, the result is often so slight that only a side by side test could reveal any difference to the human ear, and even then it will generally be slight.For $2 worth of stuffing, it would be silly not to have an improvement, no matter how slight, but don&#039;t expect any major changes to be heard after adding the fill. Only a db meter or a well trained ear, listening to very familiar tracks, will prove there&#039;s a difference.However, in certain types of enclosures the difference will be much more substantial. It&#039;s best to consider these needs when drafting the design for an enclosure, in order to ensure you get what you expect.&quot;Better damping and better transients is achieved by shooting for a lower system Q which can be accomplished by either making the enclosure larger or by adding stuffing/damping material such as polyfill, Dacron, fiberglass, acoustic foam, or any other suitable type of fill material.&nbsp; Box stuffing will also affect f3 by either raising it or lowering it depending upon the type and amount of stuffing used.&quot; (In reference to sealed enclosures)&quot;The length of the transmission line corresponds to the 1/4 wavelength of the resonant frequency of the driver.&nbsp;&nbsp; The t-line is almost always filled with various types of stuffing material which help reduce the speed of sound through the t-line allowing shorter line lengths while still achieving&nbsp; the proper tuning.&nbsp; For example, a transmission line for a given driver with an Fs of 25 Hz without any fill would need to be nearly three times longer than the same driver in a transmission line that was damped with 8kg/m^3 of wool.&quot; (In reference to transmission line enclosures)&nbsp; Source: <a href="http://www.danmarx.org/audioinnovation/theories.html" target="_blank">http://www.danmarx.org/audioinnovation/theories.html</a></blockquote>

[QUOTE="bladebarrier, post: 5191874, member: 603808"] [URL="http://www.bcae1.com/spboxad1.htm"]http://www.bcae1.com/spboxad1.htm[/URL] If you scroll to the very last graph in the above link, you'll find a visual respresentation of the difference fill makes for a particular example. As you can see, the result is often so slight that only a side by side test could reveal any difference to the human ear, and even then it will generally be slight. For $2 worth of stuffing, it would be silly not to have an improvement, no matter how slight, but don't expect any major changes to be heard after adding the fill. Only a db meter or a well trained ear, listening to very familiar tracks, will prove there's a difference. However, in certain types of enclosures the difference will be much more substantial. It's best to consider these needs when drafting the design for an enclosure, in order to ensure you get what you expect. "Better damping and better transients is achieved by shooting for a lower system Q which can be accomplished by either making the enclosure larger or by adding stuffing/damping material such as polyfill, Dacron, fiberglass, acoustic foam, or any other suitable type of fill material. Box stuffing will also affect f3 by either raising it or lowering it depending upon the type and amount of stuffing used." [B](In reference to sealed enclosures)[/B] "The length of the transmission line corresponds to the 1/4 wavelength of the resonant frequency of the driver. The t-line is almost always filled with various types of stuffing material which help reduce the speed of sound through the t-line allowing shorter line lengths while still achieving the proper tuning. For example, a transmission line for a given driver with an Fs of 25 Hz without any fill would need to be nearly three times longer than the same driver in a transmission line that was damped with 8kg/m^3 of wool." [B](In reference to transmission line enclosures) [/B] Source: [URL="http://www.danmarx.org/audioinnovation/theories.html"]http://www.danmarx.org/audioinnovation/theories.html[/URL] [/QUOTE]

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