Wohler AMP2-VSD User Manual page 10

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B
9
Phase Indication LEDs
These three LEDs indicate the instantaneous and average phase (polarity) conditions between the two signals in the channel
pair (or downmix) assigned to the left and right speaker channels. The two smaller LEDs labeled FAST show instantaneous
phase relationships in the signal. The larger LED labeled AVG will indicate the average phase condition. Indication is as
follows:
The left FAST LED glows (or blinks) GREEN for in-phase signals.
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The right FAST LED glows (or blinks) AMBER for out-of-phase signals.
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The large AVG LED indicates the average phase condition by glowing GREEN for in-phase signals, or RED for
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out-of-phase signals.
In general, observing the AVG LED alone is sufficient for proper phase monitoring. While it is normal for stereo signals to
contain some intermittant instantaneous out-of-phase and in-phase conditions (FAST LEDs), a steady RED glow of the
AVG LED indicates an out-of-phase alarm condition.
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AES Status LEDs (AES 1 and AES 2)
These two bi-color GREEN/RED LEDs (AES1 and AES2) indicate the input presence and status of the two AES input
signals. Either LED glows GREEN as long as a valid AES/EBU digital datastream for the associated input channel is
being received. Either LED glows RED to indicate errors in signal reception or data errors (if the data has been tagged
as inappropriate for conversion to analog by having the validity bit set). These LEDs function whether or not the AES
digital signals are selected for monitoring through the unit.
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SDI Status LED
This bi-color (GREEN/RED) LED, labeled SDI, glows GREEN as long as a valid SDI digital datastream is being
received. It glows RED if TSR errors are present in the signal. If there is no SDI signal present the LED will be unlit.
This LED functions whether or not the SDI digital signal is selected for monitoring through the unit.
Note: If you wish to disable data error indication (and leave only indication of signal reception errors) you can place
jumpers on H14 and H18 of the 919050 AES-to-Analog conversion PCB. See page 22 for component locations.
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Balance Control
This control changes the volume balance between the left and right speaker channels. Note that this control attenuates the
signal from the source, so that the left and right bass frequencies (summed together and reproduced in the woofer channel)
will respond to balance adjustments in tandem with the left and right speaker channels. See page 16 for more information
concerning the balance control characteristics.
13
AES/SDI Digital Source Select Switch
This two position toggle switch allows the operator to choose between the two digital input sources; SDI or AES.
When this toggle switch is set to AES, the unit will monitor the AES signals as input on the AES IN BNC or XLR
connectors (IN 1 and IN 2) on the rear panel (Item C or G, page 12). When this toggle switch is set to SDI, the unit will
monitor the SDI signals as input on the SDI IN BNC connector on the rear panel (Item D, page 12).
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Front Panel Features
(Continued)
© 2004 Wohler Technologies Inc. ALL rights reserved
Section 2: Operation