A couple more questions...

What is the equivelant to .06 mach in m/s ? When I input a 1000W signal into WinISD (for the 2 drivers 5ft^3, with the two 4"X13.1" vents) I get over 40m/s, according to the totorial on sounddomain this is almost double what it should be for a trunk enclosure.

Is the varible subsonic filter (15Hz or 30Hz) on my Alpine MRD-M1005 sufficent to prevent unloading the driver with this enclosure?

Is it realisitic to expect a 3db gain from porting my subs as WinISD predicts?