User manual

© 2001 Wohler Technologies Inc. ALL rights reserved
10
AMP2-V2DA User Manual P/N 821539 Rev-A
Please refer to Figure-2a on the following page to familiarize yourself with the front panel features of the AMP2-SDA unit. The
following sections describe these features and are referenced, by number, to Figure-2a.
Front Panel Features
Section 2: Operation
(Continued)
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Speakers
The AMP2-V2DA internal speaker system is comprised of two mid-range tweeter speakers (left and right) and one woofer
speaker (center). The two side channel speakers reproduce, in stereo, only the mid and high frequencies. Please note that the
woofer speaker (center) is not a dedicated Center nor LFE speaker.
Power Indication LED
This LED glows green to indicate the AMP2-V2DA is connected to mains power and an operation voltage is present.
Audio Level Meter LED Bargraph Displays (1-4)
Audio levels for the selected 4-channel source is visually displayed via these four high-resolution, 53-segment, tri-color
LED bargraph meters. Dynamic range for these meters is 65 dB and they are able to simultaneously display signal levels
using either PPM or VU standards. Alternate display modes are user selectable via a DIP switch accessible through the top
cover of the AMP2-V2DA (see page 22 and 23 for DIP switch settings and additional meter information).
Contact the factory for additional information concerning meter scales and ballistics.
Volume Control Pot
This controls the loudness of the audio reproduced by the internal speakers or connected headphone. Clock-wise rotation of
this control increases the loudness of the monitored audio.
Speaker Monitor Select (Left and Right)
Use the left switch to select any one of four selected channels for monitoring from the left speaker. Use the right switch to
select any one of four selected channels for monitoring from the right speaker. Note that the Analog/Digital Source Select
Switch (Item 7) determines which four channel source (Analog or AES) is available for assignment to the left and right
speakers.
Headphone Jack
Select the headphone audio sources as you would for the internal speakers. When you plug in headphones, the internal or
external speakers will mute. This jack accepts a standard 1/4” phone type stereo plug.
Analog/Digital Source Select Switch
This two position toggle switch allows the operator to choose between two primary input sources; "ANALOG" or "DIGITAL".
When this toggle switch is set to "ANALOG", the unit will monitor the signals as input on the rear panel "ANALOG IN"
Phoenix connectors (Item F, page 16). When this toggle switch is set to "DIGITAL", the unit will monitor the two AES IN
inputs; 1 and 2 (Items B or C, page 14).
Bargraph Brightness Trim Pot
This control is recessed into the front panel and can be accessed using a small screwdriver. Turning it clockwise will increase
the relative brightness of the bargraph display LED segments. Adjusting this one control will simultaneously affect the
brightness of all bargraph displays on the front panel.
Phase Indication LEDs
These three LEDs offer instant verification of phase (polarity) conditions in the pair of channels selected for monitoring in
the Left/Right channel speakers. There are three LEDs; the two smaller LEDs labeled "FAST" (left side of the "PHASE"
section) show instantaneous phase relationships in the signal, while the larger LED, labeled "AV G " (right side of the "PHASE"
section), will indicate the average phase condition. The small "FAST" LED on the left glows (or blinks) green when signals
are in-phase. The small "FAST" LED on the right glows (or blinks) amber for out-of-phase signals. The larger "AV G " LED
indicates the average phase condition by glowing green for in-phase conditions, or red for out-of-phase conditions. In
general, it is sufficient to regard the "AV G " LED (average phase condition) 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 (small LEDs),
a steady red glow of the larger LED almost always indicates an out-of-phase alarm condition.