MTX’ Data (we think):

Fs = 40.00 Hz
Qms = 3.0000
Qes = 0.4209
Qts = 0.3691
Vas = 93.96 Liters
Cms = 2.381E-4 M/N
Re = 6.80 Ohms
BL = 16.43 N/A
Sd = 0.0530 Sq. Meters
Mms = 0.06648 Kg
Ref Efficiency = 1.374 %
Predicted Output = 93.58 dB/1W/1M
Predicted Sensitivity =  94.28 dB/2.83v/1M
Xmax = 6.35 mm