Okay, so I got my 12' Pioneer subs a few weeks ago and I put them into an old box that I made for my other system a while back. After a few days of listening to music on my current setup, I noticed that my woofers were not hitting the lows AT ALL and I am a big fan of C&S Music so this was really disappointing for me. I ran all the parameters if the sub in bass box 6 and my recommended tuning frequency is like 21 Hz. Am I doing something wrong here? Also, Could anyone really help me out and just give me a quick rough draft of a suitable box design for this application. The specs on the sub are here http://www.pioneerusa.com/StaticFiles/Manuals/Car/TS-W3002D2_InstructionManual1120.pdf. I would be running about 1500 rms to each sub.