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Old 01-11-2009, 06:19 PM
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Default port tuning?

i was reading a build thread on here the other day, and the port calculations really confused me. everything i've ever heard/read has been that in order to keep the same tuning frequency, when adding more port area, you have to lengthen the port. but what i read the other day was a port with a pretty large port area (~100 sq inches, i think) and a length of like 3". and the guy claimed it was tuned to like 32-35 Hz.

the box i'm planning on building i have like 20 inches^2 of port area, and a length of like 28". and it's tuned at just under 32 Hz.

can anyone clarify this for me/re-explain something that i might have missed?
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Old 01-11-2009, 06:23 PM
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more port area means lower tuned....... i tune at 63 hertz... so its essentially not even a slot other than a hole in the box... lol



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Old 01-11-2009, 06:25 PM
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when i run a port length calculator on the12volt.com, it tells me that i need a longer port when i increase the port width...
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Old 01-12-2009, 06:32 PM
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anyone??
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Old 01-13-2009, 01:56 AM
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so run a longer port?
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Old 01-13-2009, 02:00 AM
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Quote:
Originally Posted by upzaw2000 View Post
more port area means lower tuned....... i tune at 63 hertz... so its essentially not even a slot other than a hole in the box... lol
no more area means higher tuned if the length is the same

any way the length of the port is very different for every box size basically the longer the lower it is tuned but other things like flares and kerfs and bends throw the tuning off he may have been tuned that low if his box was big enough I have a design drawn up for my blazer that uses 6 15's and the port is only 2.25" long (the depth of the baffle) but is tuned to 30 hz
hope that helped
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