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Old 01-07-2012, 10:50 AM
rwhitman rwhitman is offline
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Location: Austria
 
Join Date: May 2007
Posts: 12
Mein Auto: 2001 325i and 2007 X3
Here is a link to a site that has a nice calculator for figuring out the inductor needed for various low pass filters. Looks like .52mH will give a cut off of about 1200Hz with the 4 ohm speakers.

http://www.carstereo.com/help/Articles.cfm?id=2
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