Ecler MAC40v, Руководство пользователя

Страница: 8 / 34

8
The OUT1 output (34-35) is balanced or symmetrical, and the pin-out of the connector is
as follows:
Hot or direct signal > Pin 2
Cold or inverted signal > Pin 3
Ground > Pin 1
The balanced circuit simulates an output transformer, so if you wish to use OUT1 in
non-balanced mode, you should short circuit the unused pin to ground. Otherwise, the signal will not
have an appropriate level and quality.
The OUT2 output (36) is non-balanced or asymmetrical.
The MAC40v has two recording outputs: REC1 and REC2.
5. CONSIDERATIONS
5.1. Ground loops, background noise
You should always make sure that the signal sources coming to the unit, as well as all
devices connected to its outputs, do not have their grounds interconnected, that is; ground must never
come from two different devices. Should this ever happen, noises could occur and seriously interfere
the sound quality.
Cable shielding, when connected to the chassis, must never be interconnected, so as to
avoid ground loops.
The MAC40v mixer has been designed for the lowest possible background noise.
Independently from the electronic design itself, background noise level will directly depend on the right
installation and use of the mixing unit.
I. e.: setting a channel VOL to "2" and the output to "10" is not the same as the other way
round. In the first case, the signal coming to the mixing amplifier - which has got its own noise - is low,
and so is the signal-to-noise ratio (low signal). When the output amplifier boosts the whole signal we will
get a very high background noise. In the second case - with the channel fader at maximum - the mixing
level is high, and so is the signal-to-noise ratio. When the signal reaches the VOL OUTPUT and is
boosted, it will keep a much better signal-to-noise ratio than in the preceding case.
5.2. Cleaning
The front panel should not be cleaned with dissolvent or abrasive substances because
silk-printing could be damaged. To clean it, use a soft cloth slightly wet with water and neutral liquid
soap; dry it with a clean cloth. Be careful that water never gets into the amplifier through the holes of the
front panel.