TOA Electronics TA 1400 user manual Link switch, Operation modes, Stereo mode, Note for bench test

5.2 Link switch

The Link switch located on the rear panel (the central DIP-switch) is for changing the operation mode of the amplifier (see below, section 5.3).

5.3 Operation modes

5.3.1 Stereo mode

In this mode, both channels operate independently of each other. This is used for all 2-channel modes, such as stereo and bi-amping. Set the two center switches to off position for the stereo mode. The level attenuators on the front panel will control the respective channels levels.

Never connect either output terminal to ground or in parallel. The recommended minimum nominal impedance, for stereo or tandem operation, is 2 ohms per channel.

5.3.2 Note for bench test

NOTE: Channel B is always polarity reversed on the input, but polarity compensated by

!feeding the minus pin on the Channel B output with the output voltage. Channel A output is connected in normal polarity mode. By having channel A and B operating in opposite

polarity, the energy storage in the power supply is more efficient. This is significant for signals below 100 Hz (sub bass etc.) and improves the power bandwidth. Be sure to use balanced inputs on all measurement equipment (also oscilloscope probes) if you are bench testing.

Reverse operation of Channel B.

5.3.3 Tandem mode

In tandem mode both channels' inputs are linked and receive the same signal. The tandem mode is active if the Link switches are in position "On". Both level attenuators are active, allowing you to set different levels for each channel. Note that only the inputs are connected in parallel. This is NOT a parallel output mode. Never connect either output terminal to ground or in parallel.

You can use the remaining input connectors to carry signal to other amps. This is called “Daisy- chaining”.

NOTE: Always turn off the Link switch when using the amplifier for Bi-amping.

5.3.4 Bridge mono mode

Bridge mono mode is used to deliver both channels' power to a single load. The nominal impedance of the load must be more than 3 ohms. Set the Link switches to the “On” position and use one of the input connectors. You can use the remaining input connectors to carry signal to other amps. Both level attenuators must be at the same position. We recommend that you put them in the 0dB (full) position.

Connect the speaker as shown. Always use Channel A’s output connector.

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TA 1400 User Manual	11-06-02