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SA x12 v2 D2/BoxTuning/SPL

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I recently purchased a sundown audio x12 v2 d2


Sundowns website recommends the box be tuned to 32hz.

My question is, what's a good frequency for more spl? I've read that people do a 45hz-50hz tune, and also read that people do 28-30hz tune, so which is best?


Car is a 2016 Hyundai accent sedan(completely stock electrical system)


I'll be running the sub on a hifonics brz1700.1



I hope i posted this in the right forum, I'm a noob here.

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