Thiele/Small Parameters

49L7X81

Re
1.935
Ohm
electrical voice coil resistance at DC
Krm
0.00785
Ohm
WRIGHT inductance model
Erm
0.805
WRIGHT inductance model
Kxm
0.03205
Ohm
WRIGHT inductance model
Exm
0.7
WRIGHT inductance model
Cmes
1244.885
µF
electrical capacitance representing moving mass
Lces
8.66
mH
electrical inductance representing driver compliance
Res
11.675
Ohm
resistance due to mechanical losses
fs
48.0
Hz
driver resonance frequency
Mms
253.167
g
mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd)
248.71
g
mechanical mass of voice coil and diaphragm without air load
Rms
17.421
kg/s
mechanical resistance of total-driver losses
Cms
0.0425
mm/N
mechanical compliance of driver suspension
Kms
23.545
N/mm
mechanical stiffness of driver suspension
Bl
14.264
Tm
force factor (Bl product)
Qtp
0.836
total Q-factor considering all losses
Qms
4.4325
mechanical Q-factor of driver in free air considering Rms only
Qes
0.7355
electrical Q-factor of driver in free air considering Re only
Qts
0.631
total Q-factor considering Re and Rms only
Vas
3.7516
I
equivalent air volume of suspension
n0
0.056
%
reference efficiency (2 pi-radiation using Re)
Lm
79.505
dB
characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom
79.64
dB
nominal sensitivity (SPL at 1m for 1W @ Zn)
Sd
249.64
cm²
diaphragm area
Xmax
24
mm