Start-Up Procedure - American Pro Audio LAB DSP Serie Manual Del Usuario

vant channel below the lowest fundamental frequency.
WARNING: Do not put the sensitive high-gain devices (such as tape deck) above
or below the unit directly. This will form a strong magnetic field to cause a 'buzzing'
sound near the unshielded device. If you use a cabinet, we reccomend you to place
the sensitive devices at least 20 cm. to the units.

3.2.Start-up procedure

According to the users' needs, please follow the connection illustration section of the stereo,
bridge or mono mode of the manual to install, if it is necessary to change the mode, please
disconnect the power supply.
3.2.1.Precautions
Although the unit is protected when happens the internal and external fault, but you should
take the following measures to let the unit' s operation to reach the optimum performance
and the maximum safety:
1. Before using the unit, please configure the unit first to make it work normally. Include the
connections of the input wiring and output wiring. The improper wiring connection will cau-
se the serious operational difficulties. The relevant configuration of the unit, please refer to the
"Installation" section of the manual.
2. Please be careful when connect, select the signal source and control the output level. This
can save you a lot of troubles.
3. Do not short connect the ground wire and the input signal ground wire of the cable. This
will form a ground loop and cause the oscillations.
4. Tampering or modifying the circuit without authorization will be dangerous and will make
all services provided by agents lose efficacy.
5. Do not use the unit when the yellow clip LED is continued flashing.
6. Do not make the mixer overload, otherwise it will send a clipping signal to the unit. The unit
will accurately reproduce such signals, which may cause speaker damage.
7. Do not use the unit when the load impedance is lower than the nominal. Because of the
output protection of the unit, this configuration will result to the premature clipping and
speaker damage.
WARNING: Do not connect the output end to the power supply, the battery or the pri-
mary power. This may cause electrical shock.
NOTE: There is signal passing after turning on the unit, the output interface may exist
the fatal voltage.
3.3.Operation front panel
1. Fault:
It will light up red to indicate that protection is in effect. To provide protection, the unit will not
output any sound from the speakers while this indicator is lit up. It will light up if the heat sink
overheats, or if a DC voltage is detected at the amplifier outputs. Also it will light up for about a
few seconds at time of power-on, as the amplifier gets ready to operate.
2. Clip
The LED lights up orange when the output signal distortion on the corresponding channel ri-
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