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  #1  
Old 12-12-2011, 10:19 PM
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Default Update your PR on PSI

Ive been looking into doing a passive radiator setup in the girls car.

And when i look on the website there is a blank page...

I need more info!

or is there a set price..... like if i have a 15" basket is there a stock recone i can put on one for a standard 12spoke basket........


Im just uneducated.....

Thanks!

Hopefully im not the only one looking into these
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Old 12-12-2011, 10:22 PM
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We may do a few changes to them before listing them for sale on PSICarAudio.com

Basic info and prices are available for them at Fix My Speaker - Product Listing
though!
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Old 12-12-2011, 10:27 PM
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back to the basics. people start looking into these. awesome work from this guy. start a new trend
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Old 12-13-2011, 06:10 AM
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pr boxes are a great way to fit a huge port into a small box ive done a few and love them
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Old 12-13-2011, 03:27 PM
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My PR kicks butt !
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Old 12-14-2011, 01:39 AM
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is there a way to know how much weight to place on it for a tuning or do you just keep messing with it till it works......... '
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Old 12-14-2011, 01:58 AM
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To design a passive radiator alignment, start with a simple ported alignment using that driver that provides the desired box size and frequency response. Then, use the diameter of your chosen passive radiator as the "port diameter", and use this to calculate the required port length. Work out the volume occupied by this port and then use this to calculate the mass of air occupied by this port. The result is the required mass of the passive radiator. If it is too small, use a larger passive radiator and repeat the calculations.
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Old 12-14-2011, 02:02 AM
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The Subwoofer DIY Page - Passive Radiator Systems
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Old 12-14-2011, 02:21 AM
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ohhhhhhhh im soooooo doing this........

Dave, I need a 15 to match that purple carbon fiber you just did..... lol
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Old 12-14-2011, 01:01 PM
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Quote:
Originally Posted by marcotheclepto View Post
To design a passive radiator alignment, start with a simple ported alignment using that driver that provides the desired box size and frequency response. Then, use the diameter of your chosen passive radiator as the "port diameter", and use this to calculate the required port length. Work out the volume occupied by this port and then use this to calculate the mass of air occupied by this port. The result is the required mass of the passive radiator. If it is too small, use a larger passive radiator and repeat the calculations.
You shouldn't use the exact PR size though. Use the cone size. For example, the Sd of the PSI is 823cm^2. Using this calculator - Circle And Sphere Calculator you can determine this it has a diameter of 32.37091511398834 cm or 12.7444548 inches.

You can also determine the tuning of the enclosure by connecting it to Woofer Tester and running an impedance sweep. The frequency of the peak impedance is the tuning frequency of the enclosure.
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