Products description
Voice coil inductance Le 0.3 mH
T-S Parameters
Resonance Frequency fs 26 Hz
Mechanical Q factor Qms 2.5
Electrical Q factor Qes 0.45
Total Q factor Qts 0.38
Ratio fs/Qts F --
Force factor Bl 5.7 Tm
Mechanical resistance Rms 1 Kg/s
Moving mass Mms 15.5 g
Suspension compliance Cms -- mm/N
Effective cone diameter D -- cm
Effective piston area Sd 145 cm2
Equivalent volume Vas 72 ltrs
Sensitivity 86.5 dB
Ratio BL/√(Re) --
Power handling
100h RMS noise test (IEC) 70 W
Long-term Max System Power
(IEC)
-- W
Max linear SPL (rms) @ power -- dB/W
Short Term Max power -- W
Voice Coil and Magnet Parameters
Voice coil diameter 38 mm
Voice coil height -- mm
Voice coil layers --
Height of the gap -- mm
Linear excursion +/- 5 mm
Max mech. excursion +/- 10 mm
Flux density of gap -- mWb
Total useful flux -- mWb
Diameter of magnet -- mm
Height of magnet -- mm
Weight of magnet -- Kg
The Classic line consists of all the highly regarded transducers
that have been apraised and loved by so many customers over
the years. The goal has been to assemble all the diamonds,
developed over the years, speakers that fully live up to the
heritage of the brand.
Driver Highlights: Low loss rubber surround, carbon fibre/paper
cone, SD-1 motor
Classic
6½″ Midwoofer
 | 21 W 8554 - 00 | Kevlar cone, foam surround, SD motor | 8 ohm |
 | 21 W 4555 - 02 | 8 " hard paper cone, SD 1, 88.9dB | 4 ohm |
 | 21 W 8555 - 00 | Hard paper cone, low loss rubber surround, SD-1 motor | 8 ohm |
 | 21 W 8555 - 01 | Hard paper cone, low loss rubber surround, SD-1 motor | 8 ohm |
 | 25 W 8565 - 00 | Hard paper cone, low loss rubber surround, SD-1 motor | 8 ohm |
 | 25 W 8565 - 01 | Hard paper cone, low loss rubber surround, SD-1 motor | 8 ohm |
