need help with box design

[mike115 10+ year member]

hey i have a 15" rockford fosgate p2 and the max dimensions that will fit my trunk is 18" h x 18" w and 18"L.

I dont know what the best design for my sub would be to get the best sound quality so any help would be appreciated. thanks

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[RAM_Designs 5,000+ posts]

18x18x18? Only option is a sealed box in that case.

 

[mike115 10+ year member]

that is what i was planning on does the volume matter? and how would you find that?

 

[RAM_Designs 5,000+ posts]

Internal dimensions(16.5x16.5x16.5) divided by 1728..then subtract the sub displacement, which is probably around .15ft^3.

 

[mike115 10+ year member]

so then when i find the volume i will know if the dimensions will work? im new to car audio and just trying to figure things out.

-thanks

 

[RAM_Designs 5,000+ posts]

Looks like you'll have right around 2.45ft^3 after sub displacement. Go with that and see how you like it. You can always glue 2x4's or something inside the box to take up more space if you feel like the response is too bottom-heavy.

 

[mike115 10+ year member]

so it doesnt really matter how much volume it has? it wont wreak the sub or anything?

 

[1rockford1 5,000+ posts]

have ram draw up a plan for you. he did for me and tbh he is a great guy and not only can he come up with something im sure you can ask about geting the darn box together lol.

 

[RAM_Designs 5,000+ posts]

so it doesnt really matter how much volume it has? it wont wreak the sub or anything?

The size of the box will affect the response curve and transient response(how well it can replay quick musical passages). A larger box will also slightly lower the mechanical power handling of the sub, ie: it will take less power to reach mechanical limits.