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Subwoofers
small sealed vs. large sealed, spl
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<blockquote data-quote="audioholic" data-source="post: 1208079" data-attributes="member: 549629"><p>I have quotes too. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif</p><p></p><p>"An infinite baffle speaker design is defined as an enclosure that contains a greater volume of air than the Vas requirement of the driver. An infinite baffle system can easily be applied to an automobile. This is accomplished by mounting the speakers on a board and using the trunk of the vehicle as the other walls of the enclosure. It is important that the enclosure be tightly sealed such that no air moves from the front to the back of the cone. Look for speakers where the Qts is greater than .6, and a Vas figure lower than the volume available, when selecting a woofer for an infinite baffle system." - <a href="http://www.electronixwarehouse.com/education/glossary/I.htm" target="_blank">http://www.electronixwarehouse.com/education/glossary/I.htm</a></p><p></p><p>"An infinite baffle design is defined as an enclosure that contains a greater volume of air than the Vas of the driver." - MTX Audio - <a href="http://mtx.com/caraudio/education/enclosureDesign.cfm" target="_blank">http://mtx.com/caraudio/education/enclosureDesign.cfm</a></p><p></p><p>"Vas stands for acoustical suspension volume</p><p></p><p>Vas is basically the maximum amount of airspace needed for an acoustical suspension in a sealed box. Anything beyond that would be considered infinite baffle." - Jmac - <a href="http://forums.caraudio.com/vb/showthread.php?t=20115&amp;highlight=%22infinite+baffle%22+vas" target="_blank">http://forums.caraudio.com/vb/showthread.php?t=20115&amp;highlight=%22infinite+baffle%22+vas</a></p><p></p><p>So a quote doesn't explain it. Ive read the speaker design cookbook also, albeit many years ago. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif But as you can see, Ive found quotes, from experts and even just from knowledgeable people on this board, stating IB is anything beyond Vas, not a multiple of it. Clearly there is some confusion even within the industry.</p><p></p><p>Again, Vas as defined: "the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker"</p><p></p><p>Seemingly by definition of Vas, being merely greater than it, not by a factor of 3, would offer compliance less than that of the suspension itself. Why would we need to go 3x beyond this point before enclosure air volume compliance becomes a non-issue? Quoting one source simply stating it is does not prove one way or the other.</p></blockquote><p></p>
[QUOTE="audioholic, post: 1208079, member: 549629"] I have quotes too. [IMG]//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif[/IMG] "An infinite baffle speaker design is defined as an enclosure that contains a greater volume of air than the Vas requirement of the driver. An infinite baffle system can easily be applied to an automobile. This is accomplished by mounting the speakers on a board and using the trunk of the vehicle as the other walls of the enclosure. It is important that the enclosure be tightly sealed such that no air moves from the front to the back of the cone. Look for speakers where the Qts is greater than .6, and a Vas figure lower than the volume available, when selecting a woofer for an infinite baffle system." - [URL="http://www.electronixwarehouse.com/education/glossary/I.htm"]http://www.electronixwarehouse.com/education/glossary/I.htm[/URL] "An infinite baffle design is defined as an enclosure that contains a greater volume of air than the Vas of the driver." - MTX Audio - [URL="http://mtx.com/caraudio/education/enclosureDesign.cfm"]http://mtx.com/caraudio/education/enclosureDesign.cfm[/URL] "Vas stands for acoustical suspension volume Vas is basically the maximum amount of airspace needed for an acoustical suspension in a sealed box. Anything beyond that would be considered infinite baffle." - Jmac - [URL="http://forums.caraudio.com/vb/showthread.php?t=20115&highlight=%22infinite+baffle%22+vas"]http://forums.caraudio.com/vb/showthread.php?t=20115&highlight=%22infinite+baffle%22+vas[/URL] So a quote doesn't explain it. Ive read the speaker design cookbook also, albeit many years ago. [IMG]//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif[/IMG] But as you can see, Ive found quotes, from experts and even just from knowledgeable people on this board, stating IB is anything beyond Vas, not a multiple of it. Clearly there is some confusion even within the industry. Again, Vas as defined: "the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker" Seemingly by definition of Vas, being merely greater than it, not by a factor of 3, would offer compliance less than that of the suspension itself. Why would we need to go 3x beyond this point before enclosure air volume compliance becomes a non-issue? Quoting one source simply stating it is does not prove one way or the other. [/QUOTE]
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