Parameter

Wired in Series

Description of Measurement

Electrical Parameters

Re

3.6 Ohm

Electrical voice coil resistance at DC

Fo

37.489 Hz

Drive resonance frequency

Mechanical Parameters (Using Laser)

Mms

247.977 g

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

Mmd (Sd)

242.091g

Mechanical mass of voice coil and diaphragm without air load

Cms

72.683 mm N

Mechanical compliance of drive suspension

Bl

21.670 N A

Force factor (Bl product)

Loss Factors

Qms

2.743

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

Qes

0.448

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

Qts

0.385

Total Q-factor considering Re and Rms only

Other Parameters

Vas

22.939

Equivalent air volume of suspension

n0

0.261%

Reference efficiency (2 pi-radiation using Re)

Sd

47.144 cm²

Diaphragm area

SPL

86.2dB

sensitivity