Need help with box

[joyce12]

I have an american bass HD 18 and i want to make a custom box for my back seat in my 1997 camaro but im not sure how big I should make it any suggestions?

[Joe X]

Post your maximum dims and amplifier model.

[joyce12]

40lengthx20tallx20width and i got an audiopipe 1800d

[getlocivic]

in back seat location id go sub and port forward... maybe sub up port forward..

[john253a]

box seems a bit small for an 18"

[joyce12]

i could make it alittle taller but the length and the width is kinda my max out for my car should i make it taller?

[Joe X]

Try to reach 5.5 cubic feet net,