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post #1 of 6 Old 07-09-2013, 01:25 PM - Thread Starter
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I have a !.4 cuft sealed box with an 8 year old 12" European 4ohm sub. I want to port the box to get some lower notes. I don't expect miracles but would like to know the optimum frequency to tune the box to and what the optimum port width should be for that volume enclosure.
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post #2 of 6 Old 07-09-2013, 01:51 PM
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You would need the TS parameters of the subwoofer driver, in order to compute the diameter and length of the port. There are free softwares that does the computing for you like REW. Without the TS parameters your shooting blind
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post #3 of 6 Old 07-09-2013, 04:48 PM
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Originally Posted by qguy View Post

There are free softwares that does the computing for you like REW.
WinISD, not REW, which is room response measurement software.

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post #4 of 6 Old 07-10-2013, 03:32 PM - Thread Starter
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Thanks for the info. Will come in handy when I decide to build a 'real' box. For right now though, I think I am 'shooting blind'.The sub is a 10 year old 4ohm 12 incher that was overpriced when I bought itin Spain some 10 years ago For 40 Euros. There is no longer any info of that manufaturer or make and model on the internet. What I would really appreciate, is an educated guess basd on experience. I think the main challenge is porting a 1.4 cuft box for a 12" sub. So might a 2" port perform any better than a 3" and then what might be a half decent frequency to tune it to. I realy don't expect miracles.
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post #5 of 6 Old 07-10-2013, 07:11 PM
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Originally Posted by Chriscake View Post

What I would really appreciate, is an educated guess basd on experience. I think the main challenge is porting a 1.4 cuft box for a 12" sub. So might a 2" port perform any better than a 3" and then what might be a half decent frequency to tune it to.
Without T/S specs on the driver one can't even make a guess.

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post #6 of 6 Old 07-13-2013, 09:27 AM
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Originally Posted by Chriscake View Post

Thanks for the info. Will come in handy when I decide to build a 'real' box. For right now though, I think I am 'shooting blind'.The sub is a 10 year old 4ohm 12 incher that was overpriced when I bought itin Spain some 10 years ago For 40 Euros. There is no longer any info of that manufaturer or make and model on the internet. What I would really appreciate, is an educated guess basd on experience. I think the main challenge is porting a 1.4 cuft box for a 12" sub. So might a 2" port perform any better than a 3" and then what might be a half decent frequency to tune it to. I realy don't expect miracles.
Chris

Without the T/S parameters you are groping in the dark. Alternatively, you can buy DATS (Dayton Audio Testing System) and determine the T/S parameters for the said driver;

http://www.amazon.com/Dayton-Audio-DATS-Test-System/dp/B007Q2NRU0/ref=sr_1_1?ie=UTF8&qid=1373732672&sr=8-1&keywords=dayton+audio+test+system

but knowing that you bought that sub for $40, spending an extra $100 to know its T/S parameters isn't worth it. I reckon you can buy some really nice used driver on eBay for that kind of money and then we can start from there. Otherwise, it's all waste of effort and time.

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