APP EM-4102 Benutzerhandbuch - Seite 8

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ΣM SERIES PROFESSIONAL POWER AMPLIFIER

3.OPERATION

Warning: Before turning on the unit, please make sure the unit is

power off, the power switch is in the "OFF / off" position, and all the

volume knob has been set to the lowest position.

3.1Speaker protection

Clipping not only make the sound worse, but also will damage the high frequency drive

unit. It is recommended you that don't do the clipping to the unit's signal to protect the

speaker. In addition, to avoid the speaker drive circuit burned which is caused by the

strong infrasound signal transmission of the unit, breathing or the high level which is

caused by the dropping of the microphone and the low frequency signals. It should take

one of the following ways:

1. Install the high-pass filter between the mixer output and unit input.

2. Use the built-in DSP to set the high-pass filter (only for the unit with DSP).

3. Install a high-pass filter at the sides of the mixer. At the premise of without

affecting the use, set the filter frequency as high as possible. For example, for music

is set to 35Hz, for the microphone is set to 75Hz. In each mixer's input channel, set

the frequency of the filter with the relevant 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 recommend you to place the sensitive devices at least 20cm

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 necessar y 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 cause 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.

Warning: Do not connect the output end to the power supply, the

batter y or the primar y power. This may cause electrical shock .

Note: There is signal passing after turning on the unit, the output

interface may exist the fatal voltage.