© 2004 Wohler Technologies Inc. ALL rights reserved
12
AMP1-VS and AMP1-VSA
User Manual P/N
821613
, Rev-
B
Section 2:
Operation
(Continued)
G
E
D
A
B
C
F
Please refer to
Figure-2b
on the facing page to familiarize yourself with the rear panel features of the
AMP1-VS
and
AMP1-VSA
unit. The following sections describe these features and are referenced, by letter, to
Figure-2b
.
Rear Panel Features
Power Connector
Attach a standard IEC-320 power cord between this connector and mains power (100 - 250VAC, 50/60 Hz). The front panel
Power LED
(
Item 7
, page
8
) will glow GREEN to indicate operating voltages are present.
Analog Output (From SDI IN) Connectors (1-4)
These four 3-pin male Phoenix connectors output
analog
signals de-embedded from the
SDI IN
input connector (
Item D
) and are
configured for balanced low impedance connections. These connectors continuously output an analog signal converted from the
SDI
inputs and are
not
affected by any selection settings. Connector pin-out information is silk-screened on the rear panel.
Digital Input Level Gain Calibration DIP Switch
Input
Level Gain Calibration
, the analog level which corresponds to a given digital input value, is settable via this DIP
switch. The factory setting is +4 dB (analog) = -20 dBFS (digital). See the silk-screened chart on the rear panel or the
diagram below for settings.
SDI Input and Output Connectors
The female BNC
SDI IN
connector receives industry standard
SDI
formatted signals and is configured for an unbalanced,
75
Ω
connection. The unit de-embeds and monitors
sub-group 1
(channels
1/2
) and
sub-group 2
(channels
3/4
) of
SDI
Group ID #1
(see page
17
for more information). Note that in the
AMP1-VSA
model, the
SDI
input is monitored
only
when the
Analog/Digital Source Select Switch
(
Item 5
, page
8
) is set to
DIGITAL
.
The female BNC
SDI OUT
loop-through connector outputs a reclocked (regenerated) copy of the signal entering the
SDI
IN
input connector and is configured for an unbalanced, 75
Ω
connection.
Level Meter DIP Switch
This DIP switch sets the
Line Level Calibration
,
Reference Level
, and
PPM/VU Display Mode
for the level meter LED
bargraph displays on the front panel. See page
19
for for setting information.
Selected Analog Output Connectors (Right [A] and Left [B])
These two 3-pin male XLR connectors are
analog
outputs of the selected source(s) as assigned to the left and right
speakers. The left connector outputs the
left
channel (
Channel A
) and the right outputs the
right
channel (
Channel B
).
Both connectors are configured for low impedance connections and the output signals are not affected by the volume/
balance controls or headphone mute. For XLR pinout information see the diagram below.
Analog Input Connectors (CH. 1 - CH. 4)
These four 3-pin male Phoenix connectors, featured only on the
AMP1-VSA
model, accept standard
analog
audio signals
and are configured for balanced 200K
Ω
connections. Note that in the
AMP1-VSA
model, the
Analog
inputs are monitored
only
when the
Analog/Digital Source Select Switch
(
Item 5
, page
8
) is set to
ANALOG
.
High (+)
Low (-)
Gnd
(Shield)
Pin-1
Pin-2
Pin-3
