1. Level Control
Calibrated detented potentiometers to alter the total gain of the power amplifi er. In order to avoid
distortions in mixing consoles upstream, these controls should normally be positioned between 0 dB
and -6 dB. The calibrated markings show the additional attenuation directly.
2. Power ON indication
This LED lights up when the mains switch is pressed. If it does not light up, the unit is not connected to
the mains or the mains fuse has blown.
3. Input indication
This LED lights up if a signal is present at the power amplifi er input. The indicator does not light up
when the input controls are turned down completely.
4. Output indication
This LED lights up if a signal is present at the power amplifi er output. The indicator goes off when the
speaker line has shorted or a protective circuit has been activated thus indicating that there is no signal
at the speaker output terminals.
5. LIMIT
This LED lights up if the limiter has been activated and the power amplifi er is being operated at the clip
level. If the LED fl ashes briefl y, this is not a cause for concern. If this LED is lit permanently, the volume
should be reduced to avoid overload damages to the connected loudspeaker systems.
6. PROTECT
When this LED lights up during operation, one of the protection circuits against over-temperature,
overload, shorted outputs, radio frequency interference or DC faults has been triggered. The cause of
the error e.g. a shorted loudspeaker line must be remedied. In case of overheating, wait a little until the
amplifi er switches back to operating mode itself.
7. POWER Switch
The unit is switched on via the power switch. The loudspeaker outputs are switched on via delayed
relays so that no startup transients are audible. A current limiter prevents startup peaks on the mains
line and prevents the mains fuse from blowing.
FRONT PANEL
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