Thoughts of Seismic Audio?

I've seen Seismic Audio for sometime now, just wondering if anyone has experience with the 'New Madrid 18'.

They recently gave the TS Parameters:
Resonant Frequency (fs): 48Hz
DC Resistance (Re): 9.5 Ohm
Mechanical Q (Qms): 2.3
Electromagnetic Q (Qes): 1.1
Total Q (Qts): 0.75
Compliance Equivalent Volume (Vas): 157.7 Ltr
Mechanical Compliance of Suspension (Cms): 63mm/N
BL Product (BL): 21.2 Tm
Diaphragm Mass Airload (Mms): 173.5g
Surface Area of Cone (Sd): 1.3k cm2

Nothing about X-Max and a rather high RE and fs.