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DISTRIBUTION AMPLIFIER/ZONE MIXER/MIC SPLITTER DA-410.
5. OPERATION
The utility of the distribution amplifier/zone mixer/mic splitter is to process two input stereo
signals entering the unit to obtain five output stereo signals, both with independent level control.
Used as mixer (Zone Mixer), the unit could control five zones in stereo mode or ten in mono
mode (or any other combination) from the mix of its two stereo input signals.
As a audio distributor, allow obtaining up to ten mono output signals, or five in stereo mode for
its use in press rooms, recording units, audio production, broadcast, etc. Since it has two stereo
inputs, allow using the stereo input B as emergency input signal (reserve).
Individually selected MIC/LINE input preamplifiers allows microphone or line signals splitting to
additional mixers without quality and headroom degradation. Up to 4x8 or 1x10 active splitting is
possible.
NOTE:
For simplicity in the next explanations, we are considering the unit as operating with stereo
inputs and outputs signals. Mono operation is similar. Exceptions are detailed separately when
necessary.
TURN ON DELAY CIRCUIT
The ALTAIR DA-410 incorporates a delay circuit, consisting of a relay, which protects the
output signal from switch-on transients. This delay takes two seconds, and in the meantime the
unit remains in mute.
SIGNAL AND OVERLOAD INPUT INDICATOR
The distribution amplifier/zone mixer/mic splitter incorporates a multipurpose signal
and overload circuit on each input. The indicator is made up of two LED's (one red and
one green) placed at the unit front panel.
This two point level circuit indicates the highest level reached inside the unit input circuits and
warns the operator about possible problems. When the level indicator lights green, the internal
level has reached -20 dBv. (signal present led). Should any internal level is near overload (+15 dBv)
the level indicator lights on red to warn the security limit has been surpassed. On that case the unit
has a 6 dB extra dynamic reserve or headroom. In order to correct this problem should lower the
level of that input or decreases the input signal (the output signal of the previous unit).
INPUT LEVEL CONTROL
Each stereo input (A & B) provides a gauged input level control between -
∞
and
+6 dB placed at the front panel. This input level control affect to the stereo signal level,
therefore this affect to the L & R inputs at the same time.
SIGNAL AND OVERLOAD OUTPUT INDICATOR
The unit incorporates a multipurpose signal and overload circuit on each output.
The indicator is made up of two LED's (one red and one green) placed at the unit front
panel.
