how do u tune a sub box

[jblloudclear 10+ year member]

i have to rockford fosgate power hx2's and i want to build a ported box tuned to around 30 to 35 hertz and i done know how so if u could tell me i would appreshiate it thanks

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[ctdsq 10+ year member]

tuning a box is by box size and port size and if you use fill if you call fosgate they well tell you the speck on it all you need to do