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How can I figure out what frequence my car resinates at, thanks

I am building a box, and need to know this so I know how big to make the ports
 

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easyiest way to do it....take a sub that works well in a sealed box...build an enclosure for it so it will yeild a .707 qtc....place it in the car firing in the direction that your final enclosure will be....play a sereies of sweeps while metering....see where its loudest...

The thing to reember here is that resonance changes with pressure though. So what you measure will not actually be accurate in a higher pressure situation. The res frequency will actually be higher.
 
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