5
100V LINE SYSTEM
For 100V line systems, connect the amplifier to the first speaker in the system using double-insulated speaker wire which has
adequate current rating to handle the total output of the amplifier.
Connect the “100V” output terminal to the positive (+) connection of the speaker and “COM” output to the negative (-)
connection of the speaker. Connect further speakers in parallel to the first speaker with all positive terminals and connected
together and all negative terminals connected together as shown below.
A 100V line speaker system can comprise of many speakers connected together. The determining factor for how many
speakers can be used on a single amplifier is the power rating. For most purposes, it is advised to connect as many speakers
as needed with a combined wattage of no more than 90% of the amplifier’s output power rating.
The terminals of a 100V speaker are connected to a transformer and in some cases, this transformer may be “tapped” for
different power ratings. These tapings 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 TERMINALS
These terminals are 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.
ATTENTION: Multiple combinations cannot be done at the output level.
Four different types of connections are provided. The low 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: 30W, 60W or
120W. Failure to respect this may cause permanent damage to the amplifier.
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 or 4 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).
• In addition to channel and MASTER volume controls, there are BASS and TREBLE EQ controls to adjust the tone of the
overall output. At the 12 o’clock position, these controls are applying no effect to the signal (no boost or cut). Moving the
BASS control clockwise boosts the low frequencies in the audio, whilst moving it anticlockwise will cut these low
frequencies. Likewise, moving the TREBLE control clockwise boosts the high frequencies in the audio, whilst moving it
anticlockwise will cut these high frequencies. Adjust these EQ controls to suit the type of audio signal or compensate for
the room acoustics.
REPLACING THE FUSE
If the fuse is defective, replace the fuse with a fuse of the same type and value. Before replacing the fuse, unplug mains lead.
Procedure: Step 1: Open the fuse holder on the rear panel with a fitting screwdriver.
Step 2: Remove the old fuse from the fuse holder.
Step 3: Install the new fuse in the fuse holder.
Step 4: Replace the fuse holder in the housing.
