Operation And Use; Start Up; Monitoring; Channel Gain And Equalization - Ecler AC-6 Notice D'utilisation

- Headphones: In order to achieve the best performance, they should be high impedance type
(200-600). They will be connected to the output "32" using normalized ¼'' stereo jacks. Connect
ground to sleeve, ring to right and tip to left.
- Other mixers: The MIX (38) input provides a direct access to the main mix bus, so this is a
perfect input for another mixer to be plugged in without using up a regular input.
- Power amplifiers: See paragraph 4.7.

4. OPERATION AND USE

4.1. Start up

This is made using the POWER switch (17). Immediately the 3 green leds, identified as +5V,
+18V and -18V (16) will light up, advising that the different voltages that feed the mixer are working
properly. The 5V voltage is used for the VU-meter and the LED indicators. The symmetric 18V voltage
feeds the audio circuits. Although the noise generated by powering up the AC-6 is reduced to a bare
minimum and is nearly null with the MASTER (27, 33) faders down, it is always advisable not to forget
about this power-up sequence: sound sources, mixer, equalizers, active filters and power amplifiers.
Power down the equipment by following the inverse sequence. This way the peaks or transients
produced by powering up / down a device do not affect the following one in the audio chain and, as a
result, they do not reach the loudspeakers, which are the most vulnerable audio elements in this case.

4.2. Monitoring

The AC-6 wears a visual and auditory monitoring system with headphones and CUE outputs and
double VU-meter. By activating any of the PFL switches, the input signal/s can be heard through the
headphones and seen on the right VU-meter. The left VU-meter displays the mix signal or the signals
present on output 1 or output 2, depending on the position of the handle selector OUT1/MIX/OUT2 (20).
The rotating potentiometer PFL/MIX (28) allows mixing the selected PFL channels with the main
program MIX.
It is also possible to realize monitoring using the CUE output (37), which can be controlled with
the rotating potentiometer (26). This output is fed with the same signal that feeds the headphones output
and its nominal level is 0dBV (1V).

4.3. Channel gain and equalization

These controls allow adjusting the input sensitivity and tone levels individually for each channel.
With the GAIN control (4), the input gain fine adjustment, it is possible to match the signal levels
of the different channels. This adjustment can be realized using the left and right VU-meter and the
headphones and CUE outputs. The GAIN controls have a performance margin of ±15dB and the central
position corresponds to the nominal gain of the selected input.
The tone controls (5-6-7) of all channels provide a CUT of +10dB.
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