MTX’ Data (we think):

Fs = 30.00 Hz
Qms = 3.0000
Qes = 0.5986
Qts = 0.4990
Vas = 457.49 Liters
Cms = 4.206E-4 M/N
Re = 6.80 Ohms
BL = 11.97 N/A
Sd = 0.0880 Sq. Meters
Mms = 0.06691 Kg
Ref Efficiency = 1.984 %
Predicted Output = 95.17 dB/1W/1M
Predicted Sensitivity =  95.88 dB/2.83v/1M
Xmax = 6.35 mm