Help with SP4 18" Box build

[Nepgear]

Hey there,
I would like some help with dimensions for a box for my SP4 18 subwoofer. The SP4 18 will be powered by a crescendo 3500D.

I only have very limited space inside my trunk, but I want a ported box in every case and I want it tuned to 34 Hz.
The maximum dimensions are:
Width: 86 centimeters
Depth: 47 centimeters
Height: 65cm (I want to stay at max of 60 centimeters if possible)

greetings

[Tecomah]

Yeah, have fun fitting that in your trunk man. Did get a good sub though

[afrakes]

We bought a sp4 18, to go in a trunk, then realized it was impossible lol. So we bought another sp4, a 15. Fits/works great.