Thiele/Small Parameters

43CWRT81

Re
2.07
Ohm
electrical voice coil resistance at DC
Krm
0.0023
Ohm
WRIGHT inductance mode
Erm
0.85
WRIGHT inductance mode
Kxm
0.0117
Ohm
WRIGHT inductance mode
Exm
0.75
WRIGHT inductance mode
Cmes
1187.92
µF
electrical capacitance representing moving mass
Lces
11.17
mH
electrical inductance representing driver compliance
Res
42.69
Ohm
resistance due to mechanical losses
fs
43.7
Hz
driver resonance frequency
Mms
87.729
g
mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd
84.685
g
mechanical mass of voice coil and diaphragm without air load
Rms
1.73
kg/s
mechanical resistance of total-driver losses
Cms
0.151
mm/N
mechanical compliance of driver suspension
Kms
6.61
N/mm
mechanical stiffness of driver suspension
Bl
8.594
Tm
force factor (Bl product)
Lambda
0.068
suspension creep factor
Qtp
0.723
total Q-factor considering all losses
Qms
13.924
mechanical Q-factor of driver in free air considering Rms only
Qes
0.676
electrical Q-factor of driver in free air considering Re only
Qts
0.645
total Q-factor considering Re and Rms only
Vas
8.0199
I
equivalent air volume of suspension
n0
0.095
reference efficiency (2 pi-radiation using Re)
Lm
81.99
dB
characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom
81.83
dB
nominal sensitivity (SPL at 1m for 1W @ Zn)
rmse Z
3.84
root-mean-square fitting error of driver impedance Z(f)
rmse Hx
2.22
root-mean-square fitting error of transfer function Hx (f)
Sd
193.59
cm²
diaphragm area
Xmax
8
mm