20 cm (8") HiFi woofer with polypropylene cone. Due to balanced frequency response curve suitable for 2-way-applications up to 2000 Hz and as low-midrange driver for large 4-way speaker systems as well. Due to the special basket design suitable as replacement driver for many HiFi speaker.

Technical Data
Rated power: 80 W
Maximum power: 120 W
Nominal impedance Z: 4 Ohm
Frequency response: fu–7000 Hz
(fu: Lower cut-off frequency depending on cabinet) .
Mean sound pressure level: 88 dB (1 W/1 m)
Opening angle (-6 dB): 67°/4000 Hz
Excursion limit: +/-6 mm
Resonance frequency fs: 47 Hz
Magnetic induction: 0,85 T
Magnetic flux: 400 µWb
Height of front pole-plate: 5 mm
Voice coil diameter: 30 mm
Height of winding: 11 mm
Cutout diameter: 186 mm
Net weight: 1,3 kg
D.C. resistance Rdc: 6,8 Ohm
Mechanical Q factor Qms: 5,36
Electrical Q factor Qes: 1,59
Total Q factor Qts: 1,23
Equivalent volume Vas: 44 l
Effective piston area Sd: 240 cm²
Dynamically moved mass Mms: 21 g
Force factor Bxl: 5,5 T m
Inductance of the voice coil L: 1,0 mH
Connections: 5,2 x 0,8 mm (+)
2,8 x 0,8 mm (-)