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Old 11th December 2006, 05:37 PM   #1
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Join Date: Mar 2006
Location: Haugesund
Default Tuning a PR?

Im building a 2.1 system with Tangband W3 871s and W6-1139sg.
The responsecurve for the W6 is great in a 10-15 liter box tuned to around 30hz, provided that a passive radiator is used.
Nobody likes a four foot long port...

It's supposed to be a low-cost project, and I got the woofers for just over 25$ so bying a new passive radiator for 50$++ is undesirable...

The solution is knocking the magnet of a old seas 25cm driver, and add mass.

But how do i calculate the mass needed?

Anyone know of a website with some sort of calculator or formulas needed?

Best regards
Andreas, Norway
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Old 11th December 2006, 06:08 PM   #2
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Join Date: Dec 2004
Location: Canada
Just use Unibox, it provides the means to simulate passives and their mass.
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Old 11th December 2006, 09:31 PM   #3
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Location: Haugesund
Ok, thanks.
I'll try.
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