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Generally, the AUX3/4 channel is used for monitoring purposes. Depending on the setting of the
AUX3/4 POST button, it is also possible to congure the bus for the connection of an additional,
external FX unit.
37. AUX3/4 SEND
This output provides connection for an external FX unit or, when used for monitoring, a power
amplier or active stage monitor speaker systems. Using the AUX3/4 fader allows setting the
output level in a wide range up to +20dBu. The AUX3/4 SEND is designed in Ground Sensing
technology to prevent the induction of external noise, even with long cables. Use balanced cables
for the connection of external components whenever it is possible.
38. AUX3/4 POST
As already previously described, this switch allows determining whether Pre- or Post-Fader
signals are present at the AUX3/4 channel. The corresponding yellow LED signals when the
switch is engaged and all input channel AUX3/4 controls are assigned post fader.
39. FEEDBACK FILTER
The feedback lter is a very narrow banded notch lter, which is only active in a range that is
extremely susceptible for acoustical feedback. The FEEDBACK lter rotary control sets the
corresponding frequency range. Pressing the corresponding button activates the lter. Several
circumstances and conditions have an inuence on how sensitive or insensitive your system is
for acoustical feedback. The following notes are meant to assist you in avoiding feedback and you
should take them into consideration even before you activate the feedback lter:
1. Do not position the main speaker systems behind the microphones.
2. Switch off all microphones that are not in use.
3. Consider the microphones’ different polar patterns and characteristics, when placing the
monitor speakers.
4. Do not turn up the monitor system’s volume higher than actually necessary.
5. Try to avoid extensive equalization on channels that you want to include in your monitor
mix.
6. Keep in mind, that a microphone “behaves” different when somebody stands right in front of
it.
7. Position the microphones as direct as possible to the sound source.
If you still have the feeling that the monitor system’s acoustic output is not sufcient, after
considering the above mentioned precautions, you can use the FEEDBACK lter to mute the
frequency that tends to generate feedback the most. Therefore, you have to perform the following
steps: Increase the AUX3/4 (monitor) level until the limit is reached where feedback starts. The
slightly “hovering” sound that you hear is generated by the system itself. Switch on the feedback
lter, turn the rotary control and set it at the mark where the “sound” disappears. Switching the
lter on and off lets you easily check whether you tuned in the correct frequency. The feedback
lter attenuates the level of the corresponding frequency band by about 9dB. Since the ltered
band is extremely narrow, an alteration in the sound of your monitor system is hardly audible.
Caution: Please be extremely careful in driving the system just below the feedback limit.
Careless operation, resulting in feedback noise at high SPL, can cause severe damage to your
speaker systems and – even more important – the human ear.
40. MUTE
The MUTE button mutes the Aux-Send output signal. PFL signals are not affected.
41. PFL
Through this button you can route the pre AUX3/4 fader signal to the headphones bus. The
signal is outputted for listening via the headphones output. The setting of the AUX3/4 fader is
not relevant for the signal’s volume (PRE FADER LISTEN). The meter instrument in the master
section is simultaneously switched, so that the left LED-chain indicates the level of the actually
chosen channel (in dBu), leaving you with the opportunity for adjusting the level without routing it
to the AUX3/4 SEND bus.
AUX3/4