u WOOFER GF200 2x4Ω

20 cm (8") High-End woofer with black glass fibre cone, solid aluminium die-cast basket and elastic rubber surround. Designed for multi-purpose applications due to 2 x 4 ohms double voice-coil, with excellent properties as 8 ohms drivers in series configuration. The long stroke voice-coil in conjunction with the extended rear pole plate, the vented damper, the vented magnet and the capton voice-coil carrier guarantees long strokes and highest power handling.

Rated power 120 W
Nominal impedance Z (1) 4 Ohm(2) 8 Ohm(3) 2 Ohm
Frequency response fu–8000 Hz
Mean sound pressure level (1) 85 dB (1 W/1 m)(2) 88 dB (1 W/1 m)(3) 88 dB (1 W/1 m)
Opening angle (-6 dB) 46°/4000 Hz
Excursion limit +/-10 mm
Resonance frequency fs (1) 34 Hz(2) 30 Hz(3) 35 Hz
Magnetic induction 1.3 T
Magnetic flux 930 µWb
Height of front pole-plate 6 mm
Voice coil diameter 38 mm
Height of winding 18 mm
Cutout diameter 190 mm
D.C. resistance Rdc (1) 2.9 Ohm (2) 5.8 Ohm (3) 1.4 Ohm
Mechanical Q factor Qms (1) 4.51(2) 4.12(3) 4.33
Electrical Q factor Qes (1) 0.93(2) 0.37(3) 0.44
Total Q factor Qts (1) 0.77(2) 0.34(3) 0.39
Equivalent volume Vas (1) 62 l(2) 68 l(3) 57 l
Effective piston area Sd 214 cm²
Dynamically moved mass Mms 25 g
Force factor Bxl (1) 4.6 Tm(2) 9.2 Tm(3) 4.6 Tm
Inductance of the voice coil L (1) 0.4 mH(2) 1.1 mH(3) 0.3 mH