GF 250 2 X 4 OHM

25 cm (10") High-End woofer with black glass fiber 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.

No longer available.

Technical Data

Rated power
150 Watt
Maximum power
200 Watt
Nominal impedance Z
Eine Schwingspule offen: 4 Ohm / Beide Schwingspulen in Reihe: 8 Ohm / Beide Schwingspulen parallel: 2 Ohm
Frequency response
fu - 6000 Hz
(fu: Lower cut-off frequency depending on cabinet)
Mean sound pressure level
Eine Schwingspule offen: 87 dB (1 W/1 m) / Beide Schwingspulen in Reihe: 90 dB (1 W/1 m) / Beide Schwingspulen parallel: 90 dB (1 W/1 m)
Excursion limit
20 mm
Resonance frequency fs
Eine Schwingspule offen: 26 Hz / Beide Schwingspulen in Reihe: 24 Hz / Beide Schwingspulen parallel: 26 Hz
Magnetic induction
1.1 Tesla
Magnetic flux
Eine Schwingspule offen: 1400 µ Weber / Beide Schwingspulen in Reihe: 1430 µ Weber / Beide Schwingspulen parallel: 1430 µ Weber
Height of front pole-plate
8 mm
Voice coil diameter
50 mm
Height of winding
20 mm
Cutout diameter
235 mmm
Net weight
4 kg
D.C. resistance Rdc
Eine Schwingspule offen: 3.1 Ohm / Beide Schwingspulen in Reihe: 6.2 Ohm / Beide Schwingspulen parallel: 1.6 Ohm
Mechanical Q factor Qms
Eine Schwingspule offen: 4.61 / Beide Schwingspulen in Reihe: 4.35 / Beide Schwingspulen parallel: 4.23
Electrical Q factor Qes
Eine Schwingspule offen: 0.63 / Beide Schwingspulen in Reihe: 0.29 / Beide Schwingspulen parallel: 0.31
Total Q factor Qts
Eine Schwingspule offen: 0.55 / Beide Schwingspulen in Reihe: 0.28 / Beide Schwingspulen parallel: 0.29
Equivalent volume Vas
Eine Schwingspule offen: 110 l / Beide Schwingspulen in Reihe: 134 l / Beide Schwingspulen parallel: 110 l
Effective piston area Sd
346 cm2
Dynamically moved mass Mms
54 g
Force factor Bxl
Eine Schwingspule offen: 6.5 T m / Beide Schwingspulen in Reihe: 13 T m / Beide Schwingspulen parallel: 6.5 T m
Inductance of the voice coil L
Eine Schwingspule offen: 0.77 mH / Beide Schwingspulen in Reihe: 1.54 mH / Beide Schwingspulen parallel: 0.77 mH
Frequency- and impedance response
Directivity pattern
Directivity pattern
Directivity pattern
Waterfall spectrum