TOA Electronics A-903MK2, A-906MK2, A-912MK2 Output Connections (A-903MK2)

There are eight INPUT PORTS for PLUG-IN MODULES.

Select the desired modules for each application. Plug the modules

into the INPUT PORTS.

Slide them between the guide rails and secure with two screws.

CAUTION : Modules should not be inserted or removed while

the amplifier is turned on.

Cover unoccupied INPUT PORTS with blank panels. Secure blank panels with screws.

Output Connections (A-903MK2)

The speaker outputs of the amplifier are 4 ohms, 8 ohms, 25V and 70V.

Connect speakers to any one of these outputs.

Class 2 wiring may be used.

There are two types of output;

4 ohms, 25V and 70V via output (matching) transformer

8-ohm direct output.

The connecting method differs in each case. Refer to the following diagrams.

Note : Impedances indicated below imply total speaker system (load) impedances.

(A-903MK2)

4-ohm

21-ohm

25V line

167-ohm

70V line

Loosen the screw.

Place the impedance switch in 4-ohm position.

Tighten the screw.

Note : Low-cut switch should be in "CUT" position.

Cut off unnecessary low frequency in TRANS OUTPUT to obtain best acoustic condition. The

900MK2 series amplifiers are characteristically flat even in the low frequency range. Thus, in TRANS

OUTPUT the acoustic effect and frequency-response characteristics may be altered.

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