Nominal impedance Zn (ohm) 8
Minimum impedance/at freq. Zmin (ohm/Hz) 4.9/115
Maximum impedance Zo (ohm) 53.3
DC resistance Re (ohm) 3.4
Voice coil inductance Le (mH) 4.3
Capacitor in series with 8 ohm
(for impedance compensation) Cc (µF) 22
Resonance Frequency fs (Hz) 18.9 18.9
Mechanical Q factor Qms 2.63 2.63
Electrical Q factor Qes 0.18 0.18
Total Q factor Qts 0.17 0.17
F (Ratio fs/Qts) F (Hz) 112
Mechanical resistance Rms (Kg/s) 6.12
Moving mass Mms (g) 135.3 135.4
Suspension compliance Cms (mm/N) 0.52
Effective cone diameter D (cm) 21.2
Effective piston area Sd (cm²) 352
Equivalent volume VAS (ltrs) 89.7
Force factor Bl (N/A) 17.5
Reference voltage sensitivity
Re 2.83V 1m at 115 Hz (Measured) (dB) 88.4
Voice coil diameter d (mm) 51
Voice coil length h (mm) 33
Voice coil layers n 4
Flux density in gap B (T) 1.04
Total useful flux (mWb) 2.50
Height of the gap hg (mm) 8
Diameter of magnet dm (mm) 147
Height of magnet hm (mm) 35
Weight of magnet (kg) 2.42