Outputs; Internal Adjustments; Input Sensitivity Adjustment; Output Sensitivity Adjustment - Ecler MAC55i Notice D'emploi

4.5. Outputs

The MAC55i mixer has two independent outputs, OUT1 and OUT2. Each one has its own
volume control, with a sliding fader for the output1 (16), and a rotary one for the output 2 (9). Both
outputs have a common balance control BAL (11) and a L+R (13) switch that converts an stereo
signal into a monophonic one.
You must be careful when setting up the general output level of the mixer. The "clip"
display of the connected power amplifiers must never remain permanently lighten up, but do it
occasionally by following the rhythm of the bass signals that are being played.
The MAC55i mixing unit is factory adjusted at 0dBV/1V, although this output can be
internally modified to -10dBV/0.316V, +4dBV/1.6V or +6dBV/2V. See 4.6.2.
ATTENTION: The modification of the output gain must be carried out by a qualified
technician.
OUT1 and OUT2 (29-28) outputs are NON-BALANCED OR ASYMMETRICAL.
The MAC55i has two recording outputs: REC1 and REC2 (26-25) and supply a level of -
10dBV 10k for a nominal input level.

4.6. Internal adjustments

4.6.1. Input sensitivity adjustments
The MAC55i has the possibility of internal modification of the PHONO, CD and LINE
channels input sensitivity, as mentioned in section 3.2. See diagram 7.1.
ATTENTION: The modification of the input gain range must be carried out by a qualified
technician.
4.6.2. Output sensitivity adjustments
Same as with the input sensitivities, the output levels are also internally and independently
adjustable. See diagram 7.1.

5. CONSIDERATIONS

5.1. Ground loops

You should always try that all sources which reach the mixer, as well as all devices
connected to its output, do not have their grounds interconnected between them, that is, that they
never get the ground signal through two or more different ways. Sould this ever happen, hum and
noise could appear and interfere the sound quality.
The cable shielding, when connected to the chassis, must never be interconnected
between them. This way ground loops will be avoided.

5.2. Audio connections

As a general rule of thumb, make the signal connections as short as possible and use the
best connectors and cable available. Cables and connectors are frequently undervaluated, forgetting
that a bad connection can result in a poor sound quality.
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