Well this is how those modeled up in a 4 ft3 tuned to 33 hz... I estimated the input at 550 watts... (box rise ya' know)... and left the port velocity just a little low so you can get a bigger amp eventually... it's good for up to 750 watts before you see port compression... that's a 1200 watt amp probably... anyways here it is...
Nice flat response... personally I prefer a little more output in the 30's...
but this is a GOOD response...
Do you got it from here?.. if not let me know...