Name Value Unit Comment
Electrical Parameters
Re 5.56 Ohm electrical voice coil resistance at DC
Le 0.241 mH frequency independent part of voice coil inductance
L2 0.584 mH para-inductance of voice coil
R2 13.66 Ohm electrical resistance due to eddy current losses
Cmes 253.83 mm/N electrical capacitance representing moving mass
Lces 54.95 mH electrical inductance representing driver compliance
Res 47.20 Ohm resistance due to mechanical losses
fs 42.6 Hz driver resonance frequency
Mechanical Parameters
(using laser)
Mms 15.232 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 14.37 g mechanical mass of voice coil and diaphragm without air load
Rms 1.271 kg/s mechanical resistance of total-driver losses
Cms 0.92 mm/N mechanical compliance of driver suspension
Kms 1.09 N/mm mechanical stiffness of driver suspension
Bl 7.75 N/A force factor (Bl product)
Lambda s 0.023 suspension creep factor
Loss factors
Qtp 0.34 total Q-factor considering all losses
Qms 3.21 mechanical Q-factor of driver in free air considering Rms only
Qes 0.38 electrical Q-factor of driver in free air considering Re only
Qts 0.34 total Q-factor considering Re and Rms only
Vas 22.8325 l equivalent air volume of suspension
n0 0.450 % reference efficiency (2 pi-radiation using Re)
Lm 88.73 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom 89.07 dB nominal sensitivity (SPL at 1m for 1W @ Zn)
rmse Z 3.96 % root-mean-square fitting error of driver impedance Z(f)
rmse Hx 2.50 % root-mean-square fitting error of transfer function Hx (f)
Series resistor 0.00 Ohm resistance of series resistor
Sd 132.73 cm diaphragm area