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power ratings. These tappings can be used to adjust the wattage (and output volume) of each speaker in the system to help achieve
the ideal total power of the system for the amplifier.
Speaker Terminal
This terminal is offering 3 low voltage outputs 4Ω, 8Ω, 16Ω depending on your speaker combination. A 70V/100V commercial
output is also available. Please note that one wire only should be connected to COM screw and one wire to the selected impedance
or voltage.
Multiple combinations cannot be done at the output level.
impedance section: 4Ω, 8Ω, 16Ω is designed for a small amount of speakers to be connected to your amplifier. The 70V/100V
section is especially designed for a multiple speaker distribution. When using the 70V/100V output, speakers have to be equipped
with 70V/100V transformer. The maximum amount of speakers to be placed on your distribution line is in relation to the power
allocated to each speaker. The total wattage set on the secondary side of the transformers on your speaker line must not exceed the
maximum RMS output power: 60W (MA-60D) or 120W (MA-120D). Failure to respect this may cause permanent damage to the
amplifier.
Speaker Connections
Operation Steps
When all connections to the amplifier are made, turn all rotary controls down and switch on the power and a power "ON" LED
will illuminate. Turn BASS and TREBLE controls to the 12 o'clock position (pointing straight up) and turn MASTER rotary
control up part way for testing.
Ensure a signal is being fed to one of the line inputs 1, 2, 3, 4 or 5 and gradually increase the volume control for that channel
until the output is heard through the speakers. Turn up the MASTER to the maximum required volume level and reduce the
channel volume control if necessary.
Note: The initial test can be made using the built-in USB/SD/FM audio player. The output of the amplifier is represented on the
level meter LEDs and care should be taken that the Red "0" LED is only lit momentarily during use. Anything longer than a short
flash of this LED may be indicating distortion or clipping of the output signal and the MASTER should be turned down.
If a microphone is connected to MIC1 input, make sure it is switched on and if it requires phantom power, make sure this
feature is enabled. Gradually increase its volume control whilst speaking into the microphone until the required volume level is
reached. The microphone should not be able to "hear" the speakers, which can cause feedback (squealing or howling noise).
Four different types of connections are provided. The low
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