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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.
Technical Data
Sketch
Amplitude & Impedance Frequency
Directivity pattern
Waterfall spectrum
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

Used in / Accessories:

VIB EXTRA GF

The VIB EXTRA GF is a 3-way combination in a slim-line, column-like vented cabinet. The design of this cabinet means that a large cabinetvolume (90 litres net) is achieved with relatively little loss of floor space. The woofer is mounted at the top in order to avoid annoying reflections from the floor and sympathetic resonance from the room. The narrow baffle and the asymmetric arrangement of the speaker drivers to one side generate excellent omnidirectional distribution characteristics. The result is good spatial sound output that is to a large extent independent of the listener's seating position. The crossover unit, designed especially for this choice of drivers and this cabinet, separates off the GF 250 2 x 4 Ohmfibre glass woofer at 800 Hz. The titanium mid-range dome speaker is active up to 6 KHz. From here, the DSM 25 FFL 8 Ohm tweeter takes over. The first thing you will notice about the sound produced by the VIB EXTRA GF is the remarkable band-width coverage. The lowest frequencies (20 - 30 Hz) that are not perceived as sound at all but as pressure on the body and ears come across just as readily through the VIB EXTRA GF. This bass reproduction is clear-cut and with good signal fidelity, but makes a smooth impression on the listener, not the gritty sort of bass you would get from musician's PA systems.
In "normal" sized rooms, an incredibly high level of bass is produced in the low frequency range, but not as disco-type bass, which generates most power between 80 and 100 Hz. In other words, the VIB EXTRA GFis precisely what you are looking for if you appreciate real low-range bass but without the boom. If this is still too high, it is possible to adjust certain sections of the port to match it to the room, under certain circumstances.

VOX 250 LIGHT

In a similar manner to the VOX 200 LIGHT, the concept underlying the tried-and-tested VOX 252 was adapted using different drivers but without changing any of the cabinet characteristics or shape. The VOX 250 LIGHT made a good impression thanks to its excellent acoustic characteristics. In particular in the bass department, there were almost no losses. So even with a much reduced budget, it is, indeed, possible to achieve full-range sound from powerful column speakers that are a joy to listen to if you go for the VOX 250 LIGHT.

KM 140

Ring-shaped magnets for the compensation of the stray magnetic field (magnetic shielding). The ring has to be glued on the rear pole-plate (e. g. with Pattex), reducing the stray magnetic field to a minimun, allowing speakers positionings of 20 cm apart from TV or computer screens.Suitable for: AL 200 8 OHM; AL 200 DV 2x8 OHM; GF 200 2 X 4 OHM; GF 250 2 X 4 OHM; TIW 360 8 OHM; TIW 360 DS 2 X 4 OHM; TIW 360 X 8 OHM; TIW 400 8 OHM; TIW 400 DS 2 X 4 OHM; W 250 S 4 OHM; W 250 S 8 OHM; W 300 S 4 OHM; W 300 S 8 OHM; WSP 21 S 8 OHM; WSP 26 S 8 OHM

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