Operation And Usage; Start Up; Monitoring; Channel Equalization - Ecler MAC55i Manual De Instrucciones

4. OPERATION AND USAGE

4.1. Start up

Power up the mixer by pushing the POWER (14) switch. The green pilot-light, integrated
into the switch itself, will immediately light up. Although the noise generated by powering up the
MAC55i is reduced to a bare minimum and is nearly null with the MASTER (16 and 9) faders down, it
is always advisable not to forget about this 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 does not affect the following one in the
audio chain and, as a result, they do not reach the loudspeakers, the weakest audio elements.

4.2. Monitoring

The MAC55i is equipped with an acoustical and visual monitoring system, through
headphones, CUE output and VU METER. Switching on any of the PFL/AFL (5/10-12) buttons, the
signal(s) present at the input(s) output(s) will be seen at the VU METER. If no switch is at the on
position, the signal present at the main mix bus is heard (open faders).
It is also possible to monitor through the CUE (27) output. This output carries the very
same signal than the headphones output does. Its nominal output level is -10dBV (316 mV) and it is
controlled by the rotary knob CUE VOL (8).

4.3. Channel equalization

The tone controls (2-3-4) of each channel have a range of -20 to +10dB for 100Hz, 1.8KHz
and 10Khz frequencies.

4.4. Use of the CROSSFADER

The MAC55i provides a short travel sliding potentiometer placed horizontally. This
potentiometer is called CROSSFADER (17) and enables a direct mixing of the signals present at
channels 4 and 5. This allows the disc-jockey to prepare the mixes in the turntables and switch / mix
from one to the other by simply moving the CROSSFADER.
The MAC55i's CROSSFADER has the great advantage of being removable and replaced
on-the-field from the outside. In order to replace it, just follow these instructions:
1- Remove the screws of the plate that hold the CROSSFADER.
2- Remove the set from the mixer.
3- Detach the multipin connector.
4- Replace the whole set or remove the screws that tie the potentiometer.
5- Tie the new potentiometer and the associated printed circuit and multipin
connector to the plate.
6- Attach the multipin connector.
7- Place the set on the mixer.
8- Fix the screws of the plate.
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