© 2004 Wohler Technologies Inc. ALL rights reserved
8
AMP2-DA/AVU
and
AMP2-DA/APP
User Manual P/N
821584
Rev-
A
6
7
8
4
5
1
2
3
Please refer to
Figure-2a
on the facing page to familiarize yourself with the front panel features of the
AMP2-DA/AVU
and
AMP2-
DA/APP
units. The following sections describe these features and are referenced, by number, to
Figure-2a
.
Front Panel Features
Section 2:
Operation
(Continued)
Speakers
The monitor features 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(s).
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.
Audio Level Meters - Mechanical
Audio levels for the left and right sources selected for monitoring are respectively displayed in the left and right mechanical
level meters. The
AMP2-DA/AVU
model uses meters exhibiting
VU
ballistic characteristics. The
AMP2-DA/APP
model
uses meters exhibiting
PPM
ballistic characteristics. See page
21
for
Threshold Level
adjustment and settings for the
VU
and
PPM
type of meter.
Analog/Digital Source Select Switch
This two position toggle switch allows the operator to choose between two primary input sources;
ANALOG
or
DIGITAL
•
ANALOG
= Unit will monitor the
analog
signals as input on the rear panel
ANALOG IN
XLR connectors (
Item F
,
page
14
).
•
DIGITAL
= The unit will monitor the
AES
signals as input on the selected (
1
or
2
) rear panel
AES/EBU IN
BNC
connector (
Item C
, page
12
).
AES Source Select Switch (1 or 2)
This two position toggle switch allows the operator to choose between the two rear panel
AES/EBU IN
digital input
connectors;
1
or
2
(
Item C
, page
12
). Note that in order to monitor the selected
AES
input, the
Analog/Digital Source
Select Switch
(
Item 3
) must be set to
DIGITAL
.
AES Status LED
This bi-color (GREEN/RED) LED indicates the status of the selected
AES
input signal (
1
or
2
) and functions regardless of
whether the
analog
or
AES
inputs are selected for monitoring. LED indication is as follows:
•
GREEN
= a valid
AES/EBU
digital datastream is being received
•
RED
= there are errors in signal reception
and/or
data errors (if the data has been tagged as inappropriate for
conversion to analog by having the validity bit set).
Note:
The
AES Termination and Error Indication Type DIP
switch module on the rear panel (
Item B
, page
12
) is used
to set this LED to indicate either reception
and
data errors or to indicate reception errors
only
.
An optional feature of the
AES
signal error detection is the ability to mute the audio when errors are detected in the
AES
signal. To enable this feature, a jumper is placed at
H12
of the
919117
PCB. See page
20
for location of
H12
on the
919117
PCB.
Headphone Jack
This jack accepts a standard 1/4” phone type stereo plug. Select the headphone audio sources as you would for the internal
speakers. When you plug in headphones, the speakers will mute.
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.
Power LED
This LED glows GREEN to indicate the unit is connected to mains power and an operation voltage is present.
