DD subs
when building a box ported do you tune the box to the Fs or the cabin freq.? This is for serious street boxes everyday use, reason I'm asking is because I always thought the rule of thumb was that the box once installed in the vehicle it will always play 5-10 hz higher than tuned?????
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I think what you're getting confused about is people tuning 5-10Hz below the cars resonant frequency, as this creates a peak in the response higher than what the box is tuned to, putting the box peak closer to the cabin peak.

For a musical setup this isn't really what you want.

Generally, for a daily setup, I'd tune between 30 and 40Hz, depending on the subs and car, as well as the box volume available
good luck!
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