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DIY, Audio & Video Tutorials
[Tutorial] Building a subwoofer? Sealed vs Vented (HT)
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<blockquote data-quote="Timber_MG" data-source="post: 227479" data-attributes="member: 18"><p>A model will only get you so far, but the standard values are somewhat representative of what a good effort DIY subwoofer will achieve. The higher Q values are possible in the model but in real life the Q factors are limited (even for a perfectly stiff enclosure). Port gain around tuning is hugely beneficial to getting more output (other than just the increased sensitivity around and above the tuning frequency) because the woofer cone motion is damped at that frequency and excursion requirements are significantly lower.</p><p></p><p>In practice these values allow you to get close and the rest is done either by changing the tuning frequency and/or EQ. In practice a room has far greater influences on the sound in any event and taking care of that dominates the subwoofer frequency range.</p><p></p><p>Vented subs become a bit of a mission with overly small enclosures as the port starts to become very long. There is an excellent tutorial on port flow dynamics on <a href="http://www.subwoofer-builder.com/flare-it.htm" target="_blank">http://www.subwoofer-builder.com/flare-it.htm</a> which goes into the theory.</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 227479, member: 18"] A model will only get you so far, but the standard values are somewhat representative of what a good effort DIY subwoofer will achieve. The higher Q values are possible in the model but in real life the Q factors are limited (even for a perfectly stiff enclosure). Port gain around tuning is hugely beneficial to getting more output (other than just the increased sensitivity around and above the tuning frequency) because the woofer cone motion is damped at that frequency and excursion requirements are significantly lower. In practice these values allow you to get close and the rest is done either by changing the tuning frequency and/or EQ. In practice a room has far greater influences on the sound in any event and taking care of that dominates the subwoofer frequency range. Vented subs become a bit of a mission with overly small enclosures as the port starts to become very long. There is an excellent tutorial on port flow dynamics on [url=http://www.subwoofer-builder.com/flare-it.htm]http://www.subwoofer-builder.com/flare-it.htm[/url] which goes into the theory. [/QUOTE]
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[Tutorial] Building a subwoofer? Sealed vs Vented (HT)
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