Probably -3 dB.The only one of those specs that looks off-putting to me is the 79 lbs. Well, depending on whether that 48 Hz is the - 3 dB point or (more likely) the -10 dB point.
For portability reasons I'd rather have a pair of 2x10s. Two boxes, two trips.
Still for a big cab I would prefer something deeper, close to 35 to 40 Hz.
Also something more efficient, at least 102, and more like 103 dB @1W/1m
