Dynacord PM 502, Руководство пользователя

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AUX control
The AUX control is primarily meant for establishing an independent mix, e.g. for monitor or a
second room/zone. The signal routing is always pre VOLUME control.
PK indicator
The peak indicator plays a key role when setting input levels. The PK (peak) LED on the
PM 502 provides a visual indication of the risk of distortion before you hear it through the
connected speaker systems. The peak indicator checks the signal level pre and post of the
channel’s VOLUME control and indicates the maximum of both levels. If the PK LED blinks
frequently or lights continuously, the corresponding channel is likely to start clipping and you
will need to reduce the volume slightly. The peak LED are triggered at a level of -6 dB below
the point of distortion.
If lowering the channel VOLUME is not sufficient to reduce signal peaks, carefully turn the
GAIN control down.
Keeping an eye on the indicator during a performance is also a good idea, because some
changes in the bands dynamics or even a change in keyboard settings can easily lead to
channel clipping, resulting in the degradation of the overall sound.
VOLUME control
The VOLUME control sets the volume of the corresponding channels, resulting in a balanced
mix. The control should be positioned initially at “5”, leaving you with enough flexibility to
balance the mix. The overall volume is adjusted through the use of the master controls. Even
though the channel controls offer an additional level of +15 dB, we would like to advise you to
exceed the “8” mark only in very few exceptional cases. If the PM 502’s summing bus gets
“overloaded” with too many “high level” input channels, despite its special gain structure, the
summing amplifier could be driven into clipping.
The best signal to noise ratio can be achieved if channel volume and master volume controls
are set in the same range.
PM 502 Operation | en 21
Bosch Sicherheitssysteme GmbH User manual 15-May-14 | 02 | F01U297804