thomann the t.amp pro D4-500, User Manual

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1 ON | OFF
Main switch to turn the device on or off.
2 LED Power
This LED indicates, that the unit is operational and lights up constantly as soon as the device is switched on.
3 LEDs –10 dB and –20 dB
These LEDs indicate the intensity of the input signal (–10 dB or –20 dB). If none of the LEDs lights up, increase the
signal level with the controls CH-A to CH-D and -if required- check the wiring.
If these LEDs are lit without an input signal is present, there is an error. In this case, disconnect the speakers from the
power amplifier and turn the controls for the input gain of channels CH-A to CH-D down to minimum. If the LEDs still
light up, the device must be inspected by an authorized service centre.
4 LEDs Clip
Overload indicator for channels CH-A to CH-D. These LEDs light up when the distortion of the output signal increases
1 %.
Connections and operating elements
D4-500
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