TOA Electronics TA 1400 Manuel d'utilisateur télécharger pdf (Page 9)

5.3.5 Bridge mono mode features

Bridged mono mode combines the power of both channels into one speaker. This results in twice

the voltage swing, four times the peak power and just less than three times the full power of a

single channel.

One way to understand the load and power from the amplifier’s perspective in bridged mode is that

it is zero voltage at the center of the voice-coil winding. This is because the coil is driven with

positive voltage at one pole and an equivalent negative voltage at the other pole. So, if an 8 ohms

load is connected in bridged mode, one channel shares one 4 ohms part of the load, and the other

channel shares the other 4 ohms part. The power into 4 ohms from an TA 1200 is 700W. So, the

total bridged power into the 8 ohms load will be 2 x 700 = 1400W

6 INSTALLATION

6.1 Mounting

The amplifier is two rack units high (2U) and will mount in a standard EIA 19” rack. Amplifiers may

be stacked directly on top of each other. There is no need for spacing between units. If it is the

intention to fill a rack with amplifiers, we recommend racking is started from the bottom of the rack.

It is also recommended that rear supports are used for amplifiers mounted in the middle of the

rack, especially if used as part of a portable system.

6.2 Cooling

Your amplifier uses a forced air cooling system to maintain a low and even operating temperature.

All fan cooled Tannoy amplifiers have front to rear airflow. There are several reasons for this, one

being that there is usually cooler air outside the rack than inside, and therefore the amplifiers can

run at higher continuous power levels without thermal problems. Never try to reverse the airflow, as

the Intercooler® needs a pressure chamber between the fans and heat sink, and this only works in

one direction of the airflow.

Should a heat sink get too hot, its sensing circuit will mute the hot channel. If the power supply

overheats, another sensing circuit will mute all output channels, until it cools down to a safe

operating temperature.

Make sure that there is an adequate air supply in front of the amplifier, and that the rear of the

amplifier has sufficient space to allow the exhaust to escape. If the amplifier is rack-mounted, do

not use covers or doors on the front or rear of the rack.

For installations with a central cooling system, usually found in fixed installations with a dedicated

rack room, it may be necessary to calculate the maximum heat emission. Refer to Power

consumption on page 9

Tannoy Limited

TA 1400 User Manual 11-06-02

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TOA Electronics TA 1400 Manuel d'utilisateur Page 9