Heres a sub box i made with my dad.. Coulda spent more time on creativity but it gets the job done very well.. im gonna go back eventually and re-do it but it turned out great for a quick job.. sealed very tight and hits very hard (rattles my windshield wipers)

 

Wow...make sure you have a good latch on your hatch.

 

Do you have specs and dimension of that box and why did you go mix match

 

id have to find the dimensions man.. but they were just subs i had laying around and the front subs required a very small box size and i just wanted a clean well tuned system.. it doesnt hit as hard as some 4x12s ive heard but my windshield wipers rattle haha and it is super clear and clean

 

what amps?

 

2-1400 watt boss amps.. not the best name brand but they were free pretty much.. wood&wire was all i bought

 

i use boss <.<

 

its really not that bad of stuff there better than my old jbl's