soundstream xxx 18 enclosure help!

[palolomike26]

i need it louder!! its powered by a saz-3000d in a 30hz tuned but box its little to small jus over 5 cubes i mite want the nex box tuned to mayb 33hz.. was thinking aeros?? cuz of the space issues as this box is almost maxed out my whole back cabin in my colordo quad cab.. help on enclosure tips!!

 

[palolomike26]

more like enclosure design.. preferably aero ports for more internal box volume