Wohler AMP2-VSD User Manual page 8

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B
Please refer to Figure-2a on the facing page to familiarize yourself with the front panel features of the AMP2-VSD and
AMP2-VSDA units. The following sections describe these features and are referenced, by number, to Figure-2a.
1
Speakers
The AMP2 Series monitors feature two mid-range speakers (left and right) and one woofer speaker. Two amplifier/driver
combinations handle midrange and high frequency information in the left and right (stereo) speaker channels, while the third
channel reproduces and sums the left and right channel information below the 500 Hz crossover point in the woofer (bass)
speaker. Note that the woofer channel is NOT a dedicated LFE (subwoofer) or Center channel. See page 16 for more
information concerning the AMP2 Series audio amplifier/speaker configuration.
2
Audio Level Meter LED Bargraph Displays (1-4)
Audio levels for the four selected source channels are displayed via these four tri-color LED bargraph meters. The four
bargraph meters display audio levels for the digital or analog audio sources selected for monitoring. All bargraph LED
segments are of the tri-color type (GREEN, AMBER, RED) and are user adjustable for Referrence Level, Display Mode,
Peak Hold, PPM Ballistics, Alternate Bargraph Scales, and Phase Correlation via DIP switches on the rear panel and
inside the unit. For factory set and user adjustable level meter DIP switch settings, see pages 23 and 24. For more
information about the Phase Correlation feature, see page 26. For meter specifications, see page 5.
3
Headphone Jack
This jack accepts a standard 1/4" phone type stereo headphone plug. Select the headphone audio sources as you would for
the internal speakers. When you plug in headphones, the speakers will mute.
4
Speaker Assign Channel Buttons (Left and Right)
Use the left bank of four buttons to assign one to four of the four available channels for monitoring from the left speaker
channel. Use the right bank of four buttons to assign one to four of the four available channels for monitoring from the
right speaker channel. Channel buttons toggle On/Off and will light up BLUE to indicate they are selected.
Operation for channel selection for each bank of four buttons is as follows:
1) Single Channel Select: Press and release a single channel button to select that channel (and deselect any previous
selection). Pressing and releasing the selected channel button again will deselect it.
Multi-Channel Select (Summing): Press and hold down a desired channel button, then press other channel buttons to
2)
add (sum) additional channels (or press any again to deselect). Release all buttons to accept the selection set. When
multiple channels are selected, pressing and holding an already selected channel button will allow further modification to
the selection set. Releasing all buttons accepts the new selection set. Pressing and immediately releasing an already
selected channel button will select only it and deselect all other channel selections. Note that if channels assigned to
either the left or right level meters are multi-channel (summed), then the respective level meter will indicate summed audio
levels.
If the user presses a previously selected (lighted) channel button, but then decides not to make any changes to the selection
set, the user should keep the button depressed for at least 1.5 seconds before releasing it. This will preserve the current
selection set as though the button was never pushed.
5
Power LED
This LED glows GREEN to indicate the unit is connected to mains power and an operation voltage is present.
6
Volume Control
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.
7
Analog/Digital Source Select Switch
This two position toggle switch, featured only on the AMP2-VSDA, allows the operator to choose between the 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 XLR connectors (Item K, page 14). When this toggle switch is set to DIGITAL, the
unit will monitor the digital source (AES or SDI) as selected by the AES/SDI Digital Source Select Switch (Item 13,
page 10).
8
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 all bargraph display LED segments. Adjusting this one control will simultaneously affect
the brightness of all bargraph displays on the front panel.
8
Front Panel Features
(Continued)
© 2004 Wohler Technologies Inc. ALL rights reserved
(AMP2-VSDA Only)
Section 2: Operation