4 skar 8's port help w47 h13 d15 subs up port

[izeke2001]

Hi I'm new to the sight and need help I'm building a slotted port disgn for skar 8's zvx and im having conflict over the slot port size as it stands my external box is W;47 x H:13 x D:15 and I'm 1inch thick all the way around ...these are going in the Chevy Tahoe subs up port up much help pllllsss....

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[izeke2001]

Just proof read what wrote...the box is for, 4 of the skar zvx 8's what what figured for slot was 5x11...24.62 port lengths dunno if this is right?