Recommended box size for 2 15inch fully loaded btls

[Richard 0]

Sup guys. I currently have 2 15s in my car and the box is around 4.7 cubes. If i got 2 15inch btl fully loaded subs would i have to increase the cubes of the box? Thats my max cubes that can fit in the car

[johnecon2001 82]

You have a ported box for 2 15" subs under 6 cubic feet? You should consider going with one 15" with that space.

[brach01 0]

FI recommends that you have for one single 15" BTL that you have a ported enclosure that is 3-5 cubic feet, so just double the numbers man. IF you have two then you need 6-10 cubic feet. I am currently building a ported enclosure for a single 15" BTL and it is about 4.5 cubic feet tuned to 38 hz.