Electrical Parameters

Re

4.32 Ohm

1.09 Ohm

Electrical voice coil resistance at
DC

Le

5.32 mH

1.047 mH

Frequency independent part of voice
coil inductance

L2

6.32 mH

1.412 mH

Para-inductance of voice coil

R2

8.09 Ohm

2.04 Ohm

Electrical resistance due to eddy
current losses

Cmes

641.37 µF

2573.92 µF

Electrical capacitance representing
moving mass

Lces

25.48 mH

6.38 mH

Electrical inductance representing
drive compliance

Res

45.72 Ohm

11.24 Ohm

Resistance due to mechanical losses

fs

39.4 Hz

39.3 Hz

Drive resonance frequency

Mechanical Parameters (Using
Laser)

Mms

203.494  g

201.259 g

Mechanical mass of drive diaphragm
assembly including air load and voice coil

Mmd (Sd)

196.785 g

194.549 g

Mechanical mass of voice coil and
diaphragm without air load

Rms

6.939 kg s

6.956 kg s

Mechanical resistance of
total-drive losses

Cms

0.08 mm N

0.082 mm N

Mechanical compliance of drive
suspension

Kms

12.45 N mm

12.25 N mm

Mechanical stiffness of driver
suspension

Bl

17.812 N A

8.843 N A

Force factor (Bl product)

Lambda s

-0.041

-0.043

Suspension creep factor

Loss Factors

Qtp

0.656

0.661

Total Q-factor consider all losses

Qms

7.254

7.139

Mechanical Q-factor of of drive in
free air considering Rms only

Qes

0.685

0.692

Electrical Q-factor of drive in
free air considering Re only

Qts

0.626

0.631

Total Q-factor considering Re and
Rms only

Other Parameters

Vas

12.2205 l

12.4184 l

Equivalent air volume of suspension

n0

0.105%

0.104%

Reference efficiency (2
pi-radiation using Re)

Lm

82.4 dB

82.39 dB

Characteristic sound pressure level
(SPL at 1m for 1W @ Re)

Lnom

82.06 dB

88.03 dB

Nominal sensitivity (SPL at 1m for
1W @ Zn)

Sd

327.9 cm²

327.9 cm²

Diaphragm area

EBP

57.5

56.8

Efficiency bandwidth product