Hello! I have this great sub with 500w rms, and a amplifier kenwood with 900w rms at 2 ohm. I hit 140 db's with vented box 70 liters an 2 ports 100mm x 420mm. Does anybody know what is the best box dimensions for that power of 900rms, and how power can this sub handle and how many db's can make. Thank You. I am from Croatia, and I am new in this great forum!