AUX3&4 / Master, AUX3/4 OUT, AUX3/4 Inserts

AUX3&4 / MASTER

Generally, the AUX3/4 channel is used for monitoring purposes. Depending on the setting of the AUX3/4 POST buttons, it is also possible to conﬁgure the bus for the connection of an additional, external FX unit.

37. AUX3/4 OUT

This output provides connection for monitor power ampliﬁers, active speaker systems or external FX units. Using the AUX3/4 fader allows setting the output level of this electronically balanced output in a wide range up to +20dBu. The AUX3/4 OUT – like any other XLR-type output on the CMS – is relay-switched to prevent power-on noise when switching the mixer on or off. Use balanced cables for the connection of external components whenever it is possible to prevent the induction of external noise.

38. AUX3/4 INSERTS

The low impedance output of these stereo phone-type jacks for AUX3 and 4 with breaker function is assigned to the tip (send) and the high impedance input (return) is assigned to the ring of the connector. These jacks allow incorporating external third octave band or octave band EQs, compressors, limiters, de-noisers, etc. into the AUX channel. The insertion point is pre AUX faders. The insertion point is pre master faders. As well as with the inserts of the monaural input channels, different DIRECT OUT functions can be accomplished. Please, also refer to the corresponding paragraph in the description of the MONO INPUT.

39. 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.

40. FEEDBACK FILTER

The feedback ﬁlter is a very narrow banded notch ﬁlter, which is only active in a range that is extremely susceptible for acoustical feedback. The FEEDBACK ﬁlter rotary control sets the corresponding frequency range. Pressing the corresponding ON button activates the ﬁlter. Several circumstances and conditions have an inﬂuence 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 activating the feedback ﬁlter:

1.Avoid positioning 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 aiming at the sound source as direct as possible.

If you still have the feeling that the monitor system’s acoustic output is not sufﬁcient, after considering the above mentioned precautions, you can use the FEEDBACK ﬁlter to attenuate 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 ﬁlter, turn the rotary control and set it at the mark where the “sound” disappears. Switching the ﬁlter on and off lets you easily check whether you tuned in the correct frequency. The feedback ﬁlter attenuates the level of the corresponding frequency band by about 9dB. Since the ﬁltered 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.

41. MUTE

The MUTE button mutes the Aux-Send output signal. PFL signals are not affected.