Advise on modelling enclosure for B2 Ref12

Hi All,

This is for one of my friends, he deals with B2 audio and wanted me to model an enclosure for B2 Ref12. The company recommends only sealed box between .7 - 1.2 Cuft which was surprising to begin with since the EBP for this is around 92.7 which is ideally suited for ported (IMO). To add to this, the Q for the box as per recommendation is < .5 which comes under critically damped enclosures. WinISD gave a not-so-surprisingly high value for F3 (>70). Attached are the screenshots of Winisd. Any pointers/suggestions would be really helpful.

T/s for the driver for your ready reference:
Power handling*: 600 wrms
Sensitivity: 88,3 dB
Nominal impedance: Dual 4Ω
X-Max: 20 mm
Equivalent Compliance (Vas): 114,3 L
Free Air Resonance (Fs): 20,4 Hz
Electrical “Q” (Qes): 0,22
Mechanical “Q” (Qms): 3,52
Total Speaker “Q” (Qts): 0,2
DC Resistance (Re): 4.2 Ω
Magnet weight (Oz): 2 x 76 Oz

Thanks,
Venki