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TIW 250 8 OHM

Art. No. -
25 cm (10") High-End woofer with black cellulose cone, large magnet and heavy aluminium die-cast basket. Extremely high power handling due to 50 mm voice-coil, capton voice coil carrier and magnet vent.
Technical Data
Sketch
Amplitude & Impendance Frequency
Directivity pattern
Waterfall spectrum
Rated power 200 Watt
Maximum power 350 Watt
Nominal impedance Z 8 Ohm
Frequency response fu - 3000 Hz
(fu: Lower cut-off frequency depending on cabinet) .
Mean sound pressure level 89 dB (1W/1m)
Excursion limit 20 mm
Resonance frequency fs 31 Hz
Magnetic induction 0.95 Tesla
Magnetic flux 1500 µ Weber
Height of front pole-plate 10 mm
Voice coil diameter 5 cm
Height of winding 2.5 cm
Cutout diameter 23.2 cm
Net weight 4.4 kg
D.C. resistance Rdc 5.8 Ohm
Mechanical Q factor Qms 4.39
Electrical Q factor Qes 0.35
Total Q factor Qts 0.32
Equivalent volume Vas 80 l
Effective piston area Sd 315 cm2
Dynamically moved mass Mms 45 g
Force factor Bxl 12 T · m
Inductance of the voice coil L 2.35 mH

Used in / Accessories:

ATLAS DSM MK III

The ATLAS DSM MK III is a superlative column speaker - not only because of its impressive height of 1.70 m, but above all because of its acoustic qualities.
The 5-way combination employs the TIW 400 8 Ohm high-tech speakers as long-stroke woofers, TIW 250 8 Ohm 's as internal drivers, GF 200 2 x 4 Ohm 's as fibre-glass mid-bass units and the tried-and-tested DSM 50 FFL 8 Ohm and DSM 25 FFL 8 Ohm titanium cones as mid- to high-range unit.
After considerably improving the bass range in the MK II version compared with its predecessor by using the TIW 250 8 Ohm as the inner driver, the current model has been further refined as the ATLAS DSM MK III - by including the GF 200 2 x 4 Ohm as the mid-bass unit. The result is far improved pulse dynamics, leading to even more pleasurable listening especially at peak levels.
Let it be said to all owners of the ATLAS DSM MK II, that conversion to the MK III version is remarkable easy. The crossover unit of the MK II has been retained with no change. The GF 200 2 x 4 Ohm can be fitted straight into the cut-out in the baffle of the WS 21 BF and its rim will neatly cover up the existing screw holes.

SUB T-25

The question we asked ourselves during the development of the SUB T-25 was, "Is it possible to design a subwoofer with a minimal cabinetvolume of just 30 litres as low-range bass support for home video applications and even for medium-sized column speakers?"
The answer was a definite "yes". This was realised using a special 30 litre cabinet, the TIW 250 8 Ohm and an active subwoofer module (not included in delivery!). Inside the vented enclosure, the TIW 250 8 Ohm is mounted on the baffle, so that a front-opening port makes sense both optically and acoustically. The subwoofer is then magnetically shielded using an additional compensating magnet. The amplifier module is mounted to the rear of the subwoofer. In practice, a cut-off frequency of 50 Hz provides a lower frequency extreme of just 25 Hz. Low-range bass freaks can now add this extreme bass functionality to their existing speaker arrangement at a maximum sound pressure of 106 dB. For home video applications the cut-off frequency of 100 Hz is the right choice. With this arrangement, the ratio of low-range bass to efficiency shifts in favour of the maximum level, which is then 112 dB. The lower frequency limit still rises to a remarkable 40 Hz. If set up in the corners of the room, an additional 9 dB can be added to the rated maximum acoustic pressure. In this way, it is possible to achieve optimum bass output depending on your taste and the acoustics of the room up to the limits of the rated maximum volume. The SUB T-25 is well suited as a subwoofer for small home video applications like the CT SUB/SAT 80 or CineTOP 130. It can even be used in conjunction with the centre-speaker CT CENTER 130 and the CT DIPOL 130 to make a fullrange centre-speaker or effect speaker.

VOX 251 HE

The VOX 251 HE is an upright speaker with its subwoofer TIW 250 8 Ohm let into the side-wall. This design enables the front panel to be kept very narrow making it that much easier to position. One of the most outstanding features of the TIW 250 8 Ohm is its unbelievable ability to reproduce the lowest range bass in surprisingly small cabinets. In the listening area, the bass pressure becomes tangible rather than audible, the sort of effect you would normally only expect from much larger speakers. The VOX 251 HE is, in this respect, well able to keep up with the larger column systems such as the EXPERIENCE V 20. As a result of the side-opening position of the TIW 250 8 Ohm's, the separating frequency between the subwoofer and the mid-range drivers has to be very low. This has been achieved by means of an especially intelligent frequency cross-over design.
In order not to restrict the dynamics at higher bass levels, a bass reflextube with an exceptionally large cross-section and corresponding length has been designed. In this way, flow-related losses are kept to a minimum. The vent is at the bottom in the rear wall so as not to interfer with the attractive appearance of the front face. If the speaker is to be placed right against a wall, the reflex opening can easily be positioned at the front. The bevel on the front will then, however, have to be narrower.

This new version of the VOX contains the new tweeter G 25 HE 8 Ohm.

VOX 251 HE-CENTER

The VOX 251 HE-CENTER is the corresponding centre speaker to match the VOX 251 HE. This is a horizontal speaker equipped with identical drivers. The TIW 250 8 Ohm bass speaker and a BR 14.70 tube are positioned to left and right of the mid- to high-range unit, which is arranged vertically, behind a fabric-covered frame. If required, the drivers in the speaker can be fitted with compensating magnets to shield them magnetically. The VOX 251 HE-CENTER has the same excellent soundproperties as the VOX 251 HE. The reproduction of the unbelievably sonorous low-range bass and, at the same time, extremely clear-cut mid- and high-range reproduction, is mastered effortlessly by the VOX 251 HE-CENTER. This centre speaker is the ideal choice if you want to build up a multi-channel system around the VOX 251 HE, that will appeal to both seasoned music lovers and aficionados of the cinema.

This new version contains the new tweeter G 25 HE 8 Ohm.

VOX 251 HE-DIPOL

The new VOX 251 HE-DIPOL loudspeaker is based on the VOX 251 HEmain loudspeaker and combines its excellent sound reproduction capabilities with the unique diffused sound reproduction of a dipole system. This effect speaker covers the entire frequency range and can deal effortlessly with the highest volume settings and the lowest frequency bass sounds. Doubling up the mid- to high-range unit and using the phase-inverted system at the rear of the cabinet in conjunction with the side-mounted TIW 250 8 Ohm woofer leads to the required diffused sound field with unbelievably dynamic bass reproduction. The VOX 251 HE-DIPOL was specifically designed for combining with the VOX 251 HE main loudspeakers and the VOX 251 HE-CENTER. Here, too, the principle of the bass tunnel construction was employed making full-range operation a "must" for this effect speaker. The VOX 251 HE-DIPOL is positioned to the side of the listening position with the woofer facing the ear, in order to attain the optimum listening effect. This Dipole is ideally suited to building up a multi-channel system based on the VOX 251 HE, that will guarantee you a film experience second to none.

This new version contains the new tweeter G 25 HE 8 Ohm.

VOX 252

The VOX 252 is an upright speaker with its subwoofer TIW 250 8 Ohm let into the side-wall. This design enables the front panel to be kept very narrow making it that much easier to position. One of the most outstanding features of the TIW 250 8 Ohm is its unbelievable ability to reproduce the lowest range bass in surprisingly small cabinets. In the listening area, the bass pressure becomes tangible rather than audible, the sort of effect you would normally only expect from much larger speakers. The VOX 252 is, in this respect, well able to keep up with the larger column systems such as the EXPERIENCE V 20. As a result of the side-opening position of the TIW 250 8 Ohm's, the separating frequencybetween the subwoofer and the mid-range drivers has to be very low. This has been achieved by means of an especially intelligent frequencycross-over design.
In order not to restrict the dynamics at higher bass levels, a bass reflextube with an exceptionally large cross-section and corresponding length has been designed. In this way, flow-related losses are kept to a minimum. The vent is at the bottom in the rear wall so as not to interfer with the attractive appearance of the front face. If the speaker is to be placed right against a wall, the reflex opening can easily be positioned at the front. The bevel on the front will then, however, have to be narrower.

This version of the VOX contains the high-end ceramic dome tweeter KE 25 SC 8 Ohm. Therefore the crossover was modified in the tweeter section. An 18 dB high-pass produces an optimum phase relationship between tweeter an midrange. This creates an improvement of the clear location of each individual voice or instrument.

VOX 252 MTI

The VOX 252 MTI is the current highlight in the VOX series. The uncompromising approach, involving fitting the TI 100 8 OHM as the low- to mid-range unit and the MHT 12 8 OHM as the tweeter, worked highly successfully in the TOPAS. Following the basic design concept of the VOX series, this system is fitted with two TI 100 8 OHM 's as low- to mid-range units and the TIW 250 8 OHM as the woofer.

One particularly convenient innovation is used for the first time in the VOX 252 MTI: it is now possible to tune the bass output level on the crossoverunit. Depending on the acoustic properties of the room and personal preference, the bass output might be too strong, if the speakers are placed close to a wall, for example. The adjustment unit is mounted on the crossover unit directly parallel to the woofer and enables to listener to adjust the output level between 70 Hz and 150 Hz. The lower-frequency bass is not affected. Increasing the resistance affects the bass output: 10 ohms for a minimal reduction in bass and 3.3 ohms for maximum reduction. If the adjuster is left open (i.e. resistance is infinite), bass output reduction is deactivated.

VOX 252-CENTER

The VOX 252-CENTER is the corresponding centre speaker to match the VOX 252. This is a horizontal speaker equipped with identical drivers. The TIW 250 8 Ohm bass speaker and a BR 14.70 tube are positioned to left and right of the mid- to high-range unit, which is arranged vertically, behind a fabric-covered frame. If required, the drivers in the speaker can be fitted with compensating magnets to shield them magnetically. The VOX 252-CENTER has the same excellent sound properties as the VOX 252. The reproduction of the unbelievably sonorous low-range bass and, at the same time, extremely clear-cut mid- and high-range reproduction, is mastered effortlessly by the VOX 252-CENTER. This centre speaker is the ideal choice if you want to build up a multi-channel system around the VOX 252, that will appeal to both seasoned music lovers and aficionados of the cinema.

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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