15"sa sundown d2 on 1200 watts

All the sites for box sizes and calculators I just cant seem to come up with the proper size port and so forth

I have all the room I need but everything says I need a bigger box with that 1200 watts running 1 15"

any ideas or help sizing, thanks

my 1 size was

33 x19x 17

3.5" port width

11 1/4" by 15.5"

3.7 cubes @ 32hz

 

looking to stay around 32hz

any help on proper box size is appreciated

With that much power I would suggest going on the smaller side of things. At 3 cubes you would need a 6 inch aero that is at least 21.5" in length total to get a tuning of 32Hz.