electrical voice coil resistance at DC WRIGHT inductance model WRIGHT inductance model WRIGHT inductance model WRIGHT inductance model electrical capacitance representing moving mass electrical inductance representing driver compliance resistance due to mechanical losses driver resonance frequency Mms voice coil Mmd Rms Cms Kms Bl Lambda mechanical mass of driver diaphragm assembly including air load and mechanical mass of voice coil and diaphragm without air load mechanical resistance of total-driver losses mechanical compliance of driver suspension mechanical stiffness of driver suspension force factor (Bl product) suspension creep factor equivalent air volume of suspension reference efficiency (2 pi-radiation using Re) characteristic sound pressure level (SPL at 1m for 1W @ Re) nominal sensitivity (SPL at 1m for 1W @ Zn) root-mean-square fitting error of driver impedance Z(f) root-mean-square fitting error of transfer function Hx (f) diaphragm area total Q-factor considering all losses mechanical Q-factor of driver in free air considering Rms only electrical Q-factor of driver in free air considering Re only total Q-factor considering Re and Rms only