Upon modeling it, it appears to be more of a large mid than anything. The desired frequency extension you mentioned above would be difficult to obtain even with a vented alignment, much less sealed. Sealed enclosure would be extremely small for this size driver: around 0.325 cubic ft (9.2 liters) for .7 Qtc and 0.8 cubic ft (22.7 liters) for .5 Qtc. -3 dB should be around 160 Hz. The manufacturer's provided specifications suggest an EBP (Efficiency Bandwidth Product, Fs / Qes) of 208.3. Hope this helps give you an idea. As far as OB is concerned, this probably resembles the opposite of what you'd normally want in a driver for open baffle use.
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