Thiele/Small Parameters

51MWF124

Re
3.81
Ohm
electrical voice coil resistance at DC
Krm
0.0085
Ohm
WRIGHT inductance model
Erm
0.86
WRIGHT inductance model
Kxm
0.05215
Ohm
WRIGHT inductance model
Exm
0.72
WRIGHT inductance model
Cmes
777.295
µF
electrical capacitance representing moving mass
Lces
23.04
mH
electrical inductance representing driver compliance
Res
73.735
Ohm
resistance due to mechanical losses
fs
37.65
Hz
driver resonance frequency
Mms
217.812
g
mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd)
204.923
g
mechanical mass of voice coil and diaphragm without air load
Rms
3.801
kg/s
mechanical resistance of total-driver losses
Cms
0.082
mm/N
mechanical compliance of driver suspension
Kms
12.165
N/mm
mechanical stiffness of driver suspension
Bl
16.7405
Tm
force factor (Bl product)
Qtp
0.8185
total Q-factor considering all losses
Qms
13.5425
mechanical Q-factor of driver in free air considering Rms only
Qes
0.6995
electrical Q-factor of driver in free air considering Re only
Qts
0.665
total Q-factor considering Re and Rms only
Vas
29.86985
I
equivalent air volume of suspension
n0
0.2185
%
reference efficiency (2 pi-radiation using Re)
Lm
85.415
dB
characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom
85.625
dB
nominal sensitivity (SPL at 1m for 1W @ Zn)
Sd
506.71
cm²
diaphragm area
Xmax
18.4
mm