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How much area for sound to exit from downfire box
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<blockquote data-quote="Buck" data-source="post: 8869058" data-attributes="member: 591582"><p>How many in^2 of area do you have for the exit holes under the box? That's what I always look at, just like how you'd design a t-line, based off the Sd of the woofer, somewhat. Like, if you have a total bottom opening surface area that's at least the Sd of the sub or maybe the Sd + port area net, then it sort of shows a relative restriction won't happen, because the bottom of the box has more radiating area than all radiating surfaces of everything in/on the box. That's one way to look at it. </p><p></p><p>The box also needs to be high enough from the floor to not restrict the sub and port pressure, but it usually doesn't have to be more or much than a couple of inches. You can kind of compare surface area of sound wave travel vs surface area of radiating surface to make sure the non-tuned sound wave pathways have more "port" area than the radiating surface.</p></blockquote><p></p>
[QUOTE="Buck, post: 8869058, member: 591582"] How many in^2 of area do you have for the exit holes under the box? That's what I always look at, just like how you'd design a t-line, based off the Sd of the woofer, somewhat. Like, if you have a total bottom opening surface area that's at least the Sd of the sub or maybe the Sd + port area net, then it sort of shows a relative restriction won't happen, because the bottom of the box has more radiating area than all radiating surfaces of everything in/on the box. That's one way to look at it. The box also needs to be high enough from the floor to not restrict the sub and port pressure, but it usually doesn't have to be more or much than a couple of inches. You can kind of compare surface area of sound wave travel vs surface area of radiating surface to make sure the non-tuned sound wave pathways have more "port" area than the radiating surface. [/QUOTE]
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How much area for sound to exit from downfire box
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