Wohler AMP2A-VTR User Manual page 10

AMP2A-VTR and AMP2A-VTR2 User Manual P/N 821580 REV-B
8
Phase Indication LEDs
These three LEDs indicate the instantaneous and average phase (polarity) conditions in the signal pair (of assigned channels)
monitored in 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 out-
•
of-phase signals.
In general, it is sufficient to regard the AVG LED as adequate 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 almost always indicates an out-of-phase alarm condition.
9
Balance Control Pot
This control pans the volume balance between the left and right speakers.
10 Group Select Switch (AMP2A-VTR2)
On the AMP2A-VTR2 model, this switch selects between the two groups (GROUP 1 or GROUP 2) of four channels as input on
the rear panel. It is from the selected group of four channels that the Speaker Assign Channel Buttons (Item 6, page 8) are used
to independantly assign channels to the right and left speakers.
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(Continued)
© 2004 Wohler Technologies Inc. ALL rights reserved
Section 2: Operation