s-w12d4

hi everyone i want to build a box for Alpine S-W12D4 subwoofer i model the box in WinIsd and here are Graphs my amplifire output is 560 watt rms at 2 ohms 14.4 so probably it can deiver about 450 watt rms at 13.8 volts where i want drive my subwoofer at. i should notice a can't use larger box...