Ok so i need a little help with my new system. Right Now I have 2 RE audio sex 12 d4's. The plan is to go to four very soon. But i need help with a box for them. My current box is tuned to 33 Hz and 4 cubes. (2 per sub is re audio specs). But on the new box i wanna tune lower to around 28 Hz. The goal is to get as close to a hair trick as possible with 4 12's. power will be 2600 rms per pair at 1 ohm.
Max with is 48" Max Height is 20" and depth is unknown. It will be going in my 99 expedition. Plz Help.