Need help on ported box for 2 10s

[Z3R0]

I've been trying to figure out how to build a ported box but i cant figure out the max FT^3 i can use before port displacement. Can someone please help me figure this out?//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif Below are my T/S Parameters.

Subwoofer:

Memphis Power Reference 10

Fs=33Hz

Vas=1.08 Cf.

Mms=113 Grams

Xmax=.352 in.

Qms=5.41

Qes=.34

Qts=.32

Sensitivity=87 db

Power RMS 250W

Power Peak 500W

Click to read more...

 

[Z3R0]

Ok i was thinking is 4 ft^3 to big for 2 10s?