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Sound Quality: The Sealed/Ported misconception
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<blockquote data-quote="geolemon" data-source="post: 361781" data-attributes="member: 547749"><p>lemmings follow blindly, that is, without fact or science.The rest of us on this forum are citing facts, physics, and acoustics that are not simply theoretical, they do not only exist in textbooks (although obviously they do!), but are easy to apply and test and observe. Most of us have both sets of experiences.</p><p></p><p>I'd tend to ask how you think your words transcend the words of acoustical engineers, scientists, and famous researchers, who have written those textbooks?</p><p></p><p>I sincerely hope it's not because of this misunderstanding:</p><p></p><p>This has everything to do fundamentally with sealed vs. ported enclosures. <strong>Fundamentals.</strong> //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif</p><p>Primarily, it has to do with frequency response shape:</p><p></p><p><strong>1)</strong> Ported enclosures yield greater output, as the port allows the rear-of-cone energy to escape via a small mechanical delay, allowing it to combine constructively with the front-of-cone energy. This delay boosts SPL, the sacrifice being an inherent slight smearing of the sound quality due to the phase difference between the port and the cone.</p><p></p><p><strong>2)</strong> Ported enclosures allow the designer to either design an <em>anechoic</em> response that extends very low, or to design a peak into the <em>anechoic</em> response (which is what software shows you).</p><p></p><p>When installed in-car, the "cabin gain" (again, <em>read up on cabin gain</em> //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif ) turns that anechoically-flat response into a 12dB/octave increasing curve (in the case of the former), or exaggerates and magnifies the bass-boost built into the response (in the case of the latter).</p><p></p><p>Both of these reasons boil down to a ported enclosure's natural increase in SPL compared to a sealed enclosure, and potentially a focused increase in SPL at a particular frequency range (as opposed to a general sloping increase).</p><p></p><p>By nature, the very trade-offs made to obtain higher SPL will cause tangible, unavoidable compromises in sound quality.</p><p></p><p>Arguing that your rap music "hits" harder with a vented enclosure?</p><p></p><p>No one would argue that.</p><p></p><p>Arguing that <em>sound quality</em> is "truer" to what the recording engineers layed down on the recording with a vented enclosure, in a car?</p><p></p><p>That's almost ludicrous.</p><p></p><p>Hello, Mr. Pot! I'm Mr. Kettle, and I'm thinking that your blackness is covering your eyes...Somehow, something is preventing you from comprehending the <em>unanimous</em> responses simply stating that there's no facts behind your words, yet that you are simply waving misunderstandings of symptoms and effects as if they are facts themselves... //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif</p></blockquote><p></p>
[QUOTE="geolemon, post: 361781, member: 547749"] lemmings follow blindly, that is, without fact or science.The rest of us on this forum are citing facts, physics, and acoustics that are not simply theoretical, they do not only exist in textbooks (although obviously they do!), but are easy to apply and test and observe. Most of us have both sets of experiences. I'd tend to ask how you think your words transcend the words of acoustical engineers, scientists, and famous researchers, who have written those textbooks? I sincerely hope it's not because of this misunderstanding: This has everything to do fundamentally with sealed vs. ported enclosures. [B]Fundamentals.[/B] [IMG]//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif[/IMG] Primarily, it has to do with frequency response shape: [B]1)[/B] Ported enclosures yield greater output, as the port allows the rear-of-cone energy to escape via a small mechanical delay, allowing it to combine constructively with the front-of-cone energy. This delay boosts SPL, the sacrifice being an inherent slight smearing of the sound quality due to the phase difference between the port and the cone. [B]2)[/B] Ported enclosures allow the designer to either design an [I]anechoic[/I] response that extends very low, or to design a peak into the [I]anechoic[/I] response (which is what software shows you). When installed in-car, the "cabin gain" (again, [I]read up on cabin gain[/I] [IMG]//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif[/IMG] ) turns that anechoically-flat response into a 12dB/octave increasing curve (in the case of the former), or exaggerates and magnifies the bass-boost built into the response (in the case of the latter). Both of these reasons boil down to a ported enclosure's natural increase in SPL compared to a sealed enclosure, and potentially a focused increase in SPL at a particular frequency range (as opposed to a general sloping increase). By nature, the very trade-offs made to obtain higher SPL will cause tangible, unavoidable compromises in sound quality. Arguing that your rap music "hits" harder with a vented enclosure? No one would argue that. Arguing that [I]sound quality[/I] is "truer" to what the recording engineers layed down on the recording with a vented enclosure, in a car? That's almost ludicrous. Hello, Mr. Pot! I'm Mr. Kettle, and I'm thinking that your blackness is covering your eyes...Somehow, something is preventing you from comprehending the [I]unanimous[/I] responses simply stating that there's no facts behind your words, yet that you are simply waving misunderstandings of symptoms and effects as if they are facts themselves... [IMG]//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif[/IMG] [/QUOTE]
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