You can use your 1.5 cubic foot box, and tune to 35
>Hz with a pair of 4" diameter round by 32" long vents. Set the subsonic
>filter at 30 Hz (NO LOWER!), and you should gain more output. Setup is
>crucial with high powered amps and vented boxes - the subsonic must be
>properly set you will blow your driver with that much power.

That was some advice given to me from adire. I don't know how to make 32" long vents...could someone make me a diagram or this? Or a diagram of a slot port that is tuned to the same freq, but won't create any air turb. Thanks a lot. It's for a 12 brahma.