sub box for a jetta?

[xsuperman350x 10+ year member]

hey i have a 88 jetta and i have a 15" diamond d6 and the box i have dosent fit so i made a box on the re audio calulator to what i think would fit and am pretty sure would fit but i made it so it was tuned to 39 and i donno if thats to high or jsut right? anyone got any ideas?

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[CRAZYCORNUTS18 10+ year member]

i always shoot for like 32-36 but thats just me