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<blockquote data-quote="tommyk90" data-source="post: 1389871" data-attributes="member: 545293">i&#039;d say more like 2-2.5 cubes per sub.To find the resonant frequency, you&#039;ll need a sealed box and a SPL meter.Play test tones 10-70 hz, keeping the volume the same (not loud, just enough to put up a number).&nbsp; Keep track of the score for EACH frequency.Now take that box out of the car and meter it in an open (but not windy) environment such as a garage.&nbsp; Place the meter a foot or so away from the sub (keep this distance consistent).&nbsp; Play the 10-70 hz test tones again, marking down each score for each frequency.Now, take the differene between each score (in car and in the open) for each test tone.&nbsp; For instance the score for 40 hz in the car minus the score for 40 hz in the open.The biggest difference between the scores is your resonant frequency.This is the way i have been taught.</blockquote>

[QUOTE="tommyk90, post: 1389871, member: 545293"] i'd say more like 2-2.5 cubes per sub. To find the resonant frequency, you'll need a sealed box and a SPL meter. Play test tones 10-70 hz, keeping the volume the same (not loud, just enough to put up a number). Keep track of the score for EACH frequency. Now take that box out of the car and meter it in an open (but not windy) environment such as a garage. Place the meter a foot or so away from the sub (keep this distance consistent). Play the 10-70 hz test tones again, marking down each score for each frequency. Now, take the differene between each score (in car and in the open) for each test tone. For instance the score for 40 hz in the car minus the score for 40 hz in the open. The biggest difference between the scores is your resonant frequency. This is the way i have been taught. [/QUOTE]

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