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Message: <blockquote data-quote="tommyk90" data-source="post: 1813287" data-attributes="member: 545293">Sorry, but that is an incomplete test.The 2nd part of that test involves metering the box OUTSIDE the car, say, in an open area such as outside.  Set the sensor a few feet away (making sure to keep this distance consistent), and play TONES (not a sweep, in either case) to find the SPL level of each tone.Subtract the SPL number you got on the outside metering from the SPL number from inside the vehicle for each note (30 hz SPL inside minus 30 hz SPL outside).  The biggest difference between the numbers is the resonant frequency of the vehicle.  At least this is the way I have personally been taught.But knowing the resonant frequency does NOT always reflect where the car will peak at.  As was mentioned, the box, sub, power, body style, and other things will also affect the peak note.</blockquote>

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