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The Sum of the parts.

The crossover is an important, sometimes difficult part of the design. However the
use of an optimised, well designed drive unit makes the task easier and allows using
simpler networks, which generally give better results.

It is also important to point out that a very important benefit of the Dual Concentric
technology is in connection with the crossover. With conventional discrete multi-
drivers speakers, the crossover has a dramatic effect on the speaker performance in
the frequency range where the different drivers overlap, especially on off-axis
response and on spatial dispersion. Actually, because of the detrimental effects
resulting from the fact that they are non-coincident, the drivers should ideally work in
completely split ranges of frequency. High order low and hi-pass filters are therefore
required to reduce the overlap range. Apart from the fact that it makes the design
more complex, requires more accurate components and increases the costs, a major
drawback is that higher order filters involve increased phase and group delay
distortion, which can be quite perceptible. On the other hand the low order filter used
with Dual Concentric drivers achieve a smooth phase response.

The integration of all the features described above is what makes the whole
loudspeaker system even greater than the sum of the individual parts.

SERVICING

Cabinet finish.

To remove marks and scuffs use a medium soft brush. If necessary, a little warm
water and detergent can be used but under no circumstances use a solvent or
abrasive cleaner. The surface will change colour when wet but will return to normal
when dry. For touch-up of paint chips contact your local Tannoy service agent for
materials and guidance.

Dual Concentric driver removal.

Lay the cabinet on its back. Remove the four hexagonal bolts and set aside. Ease
the driver from the front of the cabinet taking care not to mark the front surface.

Use a piece of stout cardboard to lever against if necessary. Remove the driver, note
the polarity of the internal connections and disconnect the internal wiring. Take care
not to damage the moving parts of the LF driver.

To refit the driver, connect the cables from the crossover to the LF and HF terminals.

Fit the driver into mounting hole, making sure that the internal connecting cables are
not trapped between the HF unit and the cabinet crossbrace. Fasten the bolts finger
tight and then progressively torque them down.

Drive unit servicing.

The HF unit may be fitted with a new diaphragm assembly or replaced as a complete
assembly for speed. In either case, with the driver face down, release the three bolts
securing the HF assembly and lift the HF unit vertically upwards and away from
magnetic attraction caused by the LF magnet. Replace the diaphragm - it is self-
centring - or the complete unit, taking care to align the parts correctly.

To refit the HF unit, hold it about 300 mm vertically above the LF magnet in both
hands while resting on your elbows. Slide your elbows apart and lower the HF unit
onto the back of the LF magnet. As the HF unit gets close to the magnet you will feel
the magnetic fields repelling. Align the fixing holes and secure with the bolts,
tightening down evenly. Do not tighten the bolts finally until you are sure the HF unit
is seated correctly and the two magnet systems appear parallel.

Summary of Contents for 1200

Page 1: ...REFERENCE MONITORS SYSTEM 1200 USER MANUAL ...

Page 2: ...floor and lift the carton vertically up to leave the speaker resting on its packing tray Inspect each speaker for signs of transit damage In the unlikely event of this having occurred inform the carrier and the supplier Keep all the packaging if damage has occurred as this will show evidence of excessive handling forces It is also a good idea to keep the carton for future transportation Preliminar...

Page 3: ...of the monitor loudspeakers Connecting the loudspeakers The loudspeaker can be connected to the amplifier via to two different modes of operation conventional wiring and bi wiring In the latter mode two separate pairs of cables are used to connect the amplifier to the monitor i e one for the low frequency LF and one for the high frequency HF sections The termination panels located at the back of t...

Page 4: ...e all interdependent Drive unit The drive unit used in the System 1200 monitors is part of the latest generation of Dual Concentric units designed by Tannoy Among many others features this range of drivers incorporate a dual magnet assembly tulip HF waveguide and injection moulded polypropylene LF cone The design of the HF waveguide has been arrived at by making extensive use of CAD computer aided...

Page 5: ...uency areas In that respect conventional rectangular sharp corner boxes perform especially poorly On the other hand the shape of the System 1200 has been designed with careful attention paid regarding the sculptured front panel to provide smooth rounded edges which minimise side diffractions Another problem involved in cabinet design is to ensure that the box will effectively behave as neutrally a...

Page 6: ...e will change colour when wet but will return to normal when dry For touch up of paint chips contact your local Tannoy service agent for materials and guidance Dual Concentric driver removal Lay the cabinet on its back Remove the four hexagonal bolts and set aside Ease the driver from the front of the cabinet taking care not to mark the front surface Use a piece of stout cardboard to lever against...

Page 7: ...er at higher levels is permissible provided that the lower frequency of the sweep is limited according to the voltage level for instance with levels exceeding 10V rms the frequency should be kept above 100 Hz List of spare parts PART NUMBER DESCRIPTION 9900 0314 System 1200 cabinet assembly 7900 0459 Driver kit 3139 7900 0460 Recone kit for LF unit 7900 0199 HF diaphragm assembly 6839 0050 Gasket ...

Page 8: ...DO NOT SHIP ANY PRODUCT TO TANNOY WITHOUT PREVIOUS AUTHORISATION This warranty in no way affects your statutory rights ...

Page 9: ...CURVES Figure 1 On axis anechoic response Figure 2 Impedance ...

Page 10: ...mensions HxWxD 650 mm x 397 mm x 396 mm Cabinet weight 27 kg Shipping dimensions HxWxD 720 mm x 467 mm x 472 mm Shipping weight 30 kg NOTES 1 3 dB measured at 1m in an anechoic chamber 2 Long term power handling capacity as defined in EIA standard RS426A 3 Averaged over specified bandwith for half space environment For anechoic conditions the figure is to be decreased by 3 dB Tannoy operate a poli...

Page 11: ... such that electromagnetic disturbances generated do not exceed levels allowing radio and telecommunications equipment and other apparatus to operate as intended and the apparatus has an adequate level of intrinsic immunity to electromagnetic disturbance to enable operation as specified and intended Details of the Apparatus Tannoy Monitor Loudspeaker Model Number System 1200 Associated Technical F...

Page 12: ...ephone 44 0 1236 420199 Fax 44 0 1236 428230 Internet http www tannoy com Tannoy North America Inc 335 Gage Avenue Suite 1 Kitchener Ontario CANADA N2M 5E1 Telephone 519 745 1158 Fax 519 745 2364 Tannoy Nederland BV Anthonetta Kuijlstraat 19 3066 GS Rotterdam THE NETHERLANDS Telephone 010 2860554 Fax 010 2860431 Issue 2 Part No 6481 0282 ...

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