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Enclosure Design & Construction
multiple ports
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<blockquote data-quote="paikiah" data-source="post: 124106" data-attributes="member: 545724"><p>Ok, so I had this awesome box designed in my head...</p><p></p><p>it featured quite a lot of angles, so I had to do some more calculations than a normal rectangular box...</p><p></p><p>after testing the volume in winisd pro, i was convinced...</p><p></p><p>everything was all fine and dandy......until I saw the port velocity... i remember in winisd beta, the mach figures would turn red after .16 or .17... I assume this would be audible air turbulence... but in winisd pro, the velocity was off the scale...way over scale..I'd need 8 ports to reduce that to a minimum...</p><p></p><p>Hmm, so alright, I thought I'd go with 4 X 4" ports instead... so the velocity dropped a considerable deal, but the length...whoa...50"?? 90"??? wtf???</p><p></p><p>questions</p><p></p><p>1. If I use 4 ports, then do I divide the total length by 4? or do all 4 ports have to extend to that impossible length?</p><p></p><p>2. So I thought about a slot port too... 5cm opening would create too much turbulence, so i added just a couple more cm... but the length would sometimes reach another 50~70"... so bend the ports, yeah... but it would mean that I'd need more than one bend, cause the maximum width I have is 37" (with 0.75"MDF).. what are the consequences of having a 180 degree bend? What if I have about 2 180 degree bends? (aside from the volume that the port will take)</p><p></p><p>//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif</p></blockquote><p></p>
[QUOTE="paikiah, post: 124106, member: 545724"] Ok, so I had this awesome box designed in my head... it featured quite a lot of angles, so I had to do some more calculations than a normal rectangular box... after testing the volume in winisd pro, i was convinced... everything was all fine and dandy......until I saw the port velocity... i remember in winisd beta, the mach figures would turn red after .16 or .17... I assume this would be audible air turbulence... but in winisd pro, the velocity was off the scale...way over scale..I'd need 8 ports to reduce that to a minimum... Hmm, so alright, I thought I'd go with 4 X 4" ports instead... so the velocity dropped a considerable deal, but the length...whoa...50"?? 90"??? wtf??? questions 1. If I use 4 ports, then do I divide the total length by 4? or do all 4 ports have to extend to that impossible length? 2. So I thought about a slot port too... 5cm opening would create too much turbulence, so i added just a couple more cm... but the length would sometimes reach another 50~70"... so bend the ports, yeah... but it would mean that I'd need more than one bend, cause the maximum width I have is 37" (with 0.75"MDF).. what are the consequences of having a 180 degree bend? What if I have about 2 180 degree bends? (aside from the volume that the port will take) [IMG]//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif[/IMG] [/QUOTE]
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