Sd_m 0.0143[m^2] "Diaphragm piston area"
R_m sqrt(Sd_m/pi) "Piston radius"
Vback_m 4[l] "Back volume"
R1_m 6[ohm] "Resistance"
L1_m 0.35[mH] "Inductance"
L2_m 18[g]*1[H/kg] "Inductance"
R2_m 1.4[kg/s]*1[ohm/kg*s] "Resistance"
C1_m 2.5[mm/N]*1[F*N/m] "Capacitance"
A_m 6[T*m]/1[T*m/ohm] "Gain"