Ecler MIMO4040DN, Руководство пользователя

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5.9. Remote control GPO ports
MIMO4040DN has on its rear panel 8 relay outputs NO / NC (normally open / normally
closed). Each of these outputs can have its status change associated with a trip by
means of a specific function programmed through EclerNet Manager, such as a calendar
event or the pressing of a key available on a UCP control panel. In this way, it is possible
to interact with external equipment, such as motors for projection screens or movable
partition walls, lights, sirens, GPI inputs from other equipment, etc.
6. OBSERVATIONS
7.1. Ground loops
It must be ensured at all times that the signal sources that reach the matrix, as well as
all the devices that are connected to its output, do not have the grounds interconnected,
that is to say that the gounds never reach them by two or more different paths, since, in
this way, buzzes could be produced that would even interfere with the quality of the
sound reproduction.
The shields of the cables, if they are connected to a chassis, must never be connected to
each other. This way we avoid the formation of ground loops.
7.2. Background noise
MIMO4040DN has been designed to obtain the lowest possible background noise.
Regardless of the electronic design, the background noise will depend directly on the
correct use and installation of the unit.
It is not the same, for example, to have the GAIN control of a channel at 2 and the VOL
of the output to which it is routed at maximum (case 1), to have a correct gain setting on
the input signal and the VOL level of the output channels to which it is routed at an
intermediate position (case 2). In the first case, the signal that reaches the mix amplifier,
which intrinsically has its own background noise level, is weak, so the signal-to-noise
ratio is low (low signal). When the output amplifier raises indistinctly the whole set we
will have a very high background noise level at the output.
In the second case, when the input gain is correctly adjusted, the signal received by the
matrix is large and therefore with a large signal / noise ratio as well, so when this signal
reaches the output channels and is amplified, it will have a better ratio than in the
previous case.