Sennheiser Quadpack QP 3041 Notice D'emploi page 29

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The transmitters are turned off or the transmitters are not within the
reception area:
Turn the transmitters on and make sure that there is a "free line of sight"
between the transmitters and the receiving antennas. If the receiver
position is not the best antenna position for optimum reception, use
remote antennas (see „Accessories" on page 31).
No monitoring signal available
All control LEDs for the receivers light up red – no receiver has been
selected:
Press one or several monitor keys. The control LEDs of the selected
receivers light up green.
The headphone volume control is turned fully counter-clockwise:
Slowly turn the headphone volume control clockwise.
Audio signal is too low or slightly noisy or distorted
The audio signal is too low or distorted – the output level of the Quadpack
has not been adapted to the input of the mixing console or amplifier:
Use the MIC-LINE selector switches and the AF output level controls to
adapt the output levels of the AF outputs to the inputs of your mixing
console or amplifier.
Please also observe the notes given in the receiver's instruction manual!
The monitoring signal is distorted – the volume at the monitor output is
adjusted too high so that the headphone amplifier is overmodulated:
Use the headphone volume control to reduce the volume at the monitor
output.
Note:
The monitor output has enough amplification headroom in order to
enable monitoring even at low modulation levels.