General Operation; Maintenance - Executive Audio ALPHA Série Manuel D'utilisation

2 ） Bridge mode
Fig.4- Signal output using Speakon connector
Be sure to set the mode switch on the rear panel to "bridge "(BTL).
1+、2+ Signal output (+） connect to speaker (+）
1-、2- Signal output （-） connect to speaker (-)
Parallel Mode
3）
Fig. 5- Signal output using Speakon connector
1+、2+ Signal output (+） connect to speaker (+）
1-、2- Signal output （-） connect to speaker (-)
Signal input from CHA, signal output from CHA & CHB.
Note
： Incorrect connection will result in malfunction. Make sure the connection & operation mode is correct before
turning on the power.

8. General Operation

1. Operation procedures:
1. Connect to the matching speakers (dependent on operating mode required)
2. Make sure all the input & output connections are correct and well located.
3. Make sure the mains power supply matches to the power indicated on the amplifier.
4. Connect the signal source equipment, i.e. Mixer, to the amplifier's signal input
5. Set amplifier's input level to the minimum
6. Set the mode switch to the correct operating mode (stereo, bridge, or parallel).
7. Turn on the power of signal source equipment first
8. Turn on the power of the amplifier
9. Adjust the input level to required level.
2. Operation procedure of Bridge, Parallel & Stereo mode:
A.) Stereo Mode:
a.) Turn off the power of amplifier
b.) Connect speakers to CHA and CHB outputs
c.) Set mode switch to "stereo "
Fig.（4）
Fig.（5）
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d.) Input a signal to CHA and CHB
e.) Turn on the power of amplifier
f.) Adjust CHA and CHB input level
Caution:
The amplifier will protect itself if used continuously under 2 Ohm stereo at maximum level for long
durations.
Bridge mode:
B.)
a.) Turn off the power
b.) Connect speakers to "bridge "output.
c.) Set mode switch to BTL (bridge).
d.) Input a signal to CHA
e.) Turn on the power of amplifier
f.) Adjust CHA input level.
Caution: The amplifier will protect itself if it is used continuously under 4 Ohm bridge for long durations.
C.) Parallel mode:
a.) Turn off the power
b.) Set mode switch to PAR (Parallel)
c.) Connect speakers to CHA and CHB outputs
d.) Input a signal to CHA
e.) Turn on the power of amplifier
f.) SP-1800: Adjust CHA & CHB gain controls respectively for each channel's output volume.
Caution:
The amplifier will protect itself if it is used continuously under 2 Ohm parallel for long durations.

9. Maintenance

1. Clean the unit by wiping with a slightly damp cloth. Avoid getting water inside the unit. Do not use alcohol or any
volatile liquid that will damage the unit.
2. Clean the ventilation slots regularly with a vacuum cleaner. This increases the cooling capacity of the amplifiers
fans and helps prevent temperature overheating.
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