help me decide how to build this box. Had been thinking about making it 2.4 cubes tuned to 28.5 and adding poly fill. Well, how does that sound. The overall goal of this box is clean accurate bass along all tones. The car is a cavalier. The speakers are sst6.9 and RF-60 Soundstream. Powered by turantula amps. I have two 1000D mono blocks, and a 880.4 All last years turantula line. What do you think. How would you build this box?