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Functions & Controls
Functions & Controls
POWER ON/OFF
ON - OFF switch.
The amplifier has “SOFT-START”, i.e. a device that allows to avoid high energy consumption when the
unit is switched on.
This device also delays the power feed to the load for 4 seconds, thus avoiding dangerous signal peaks
and possible damage to the speakers.
For this same reason, power output is cut off immediately when the amplifier is switched off.
NB: remember that in a sound system, the amplifiers should always be switched on last and switched off first, if possible with
their input controls set at maximum attenuation.
INPUT ATTENUATORS
Input gain attenuator potentiometers.
Attenuate the level of the external signal sent to the respective channels of the amplifier.
Continuously variable values, expressed in dB, are between:
“
∞∞
∞∞
∞”: fully closed (the signal is completely attenuated and therefore not sent to the channel
of the amplifier) and
“0”: fully open, i.e. nominal level (the signal is not attenuated in any way, so is fed to the amplifier
channel at the same level at which it arrives on input).
NB: between -30dB and 0dB the attenuators intervene with a logarithmic scale.
METERs
Output level LED indicators.
Allow to monitor the level of the respective channels of the amplifier.
Each of the 10 segments corresponds to 3dB and indicates the following conditions:
Green LEDs : indicate normal running conditions.
Yellow LEDs : light up at -6dB.
Red LEDs : indicate clipping (the audio signal level exceeds the output capacity of the
amplifier channel).
NOTE: when setting the levels, some elementary rules must be followed to ensure clean, undistorted sound. To achieve a
good Signal-to-Noise ratio and a wide dynamic range, for example, avoid allowing the red LEDs to light up continually.
It must also be remembered that an excessively high signal can damage hearing as well as amplification systems.
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