User manual

14
© 2002 Wohler Technologies Inc. ALL rights reserved
AMP2-DA Instruction and Service Manual P/N 821505 Rev-B
Please refer to Figure-2b on the following page to familiarize yourself with the rear panel features of the AMP2-DA unit. The
following sections describe these features and are referenced, by letter, to Figure-2b.
Rear Panel Features
Section 2: Operation
(Continued)
A
B
C
IN 1
Unterminated
Note: Positions S2 and S4 of DIP switch are not used.
AES Input 1 Termination (919050)
Term. 2
1
2344
1
32
IN 1
Terminated
41
3
2
1 2
3
4
AES Input 2 Termination (919050)
Term. 1 Term. 2Term. 1 Term. 2Term. 1 Term. 2Term. 1
IN 2
Unterminated
IN 2
Terminated
D
0 dB
+8 dB
+4 dB
+6 dB
-20 dBFS=
-20 dBFS=
-18 dBFS
-9 dBFS
=
=
AES D/A Conversion Gain Calibration Settings
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 2, page 10) will glow green to indicate operating voltages are present.
AES Input Termination DIP Switch
This 4-position DIP switch is used to set the termination characteristics for the AES inputs. In the event that either of the two
AES input channels is fed to downstream equipment (via the loop-throughs or "Y" or "T" connectors), then the associated DIP
switch section (S1=IN 1, S3=IN 2) must be placed in the Unterminated (UP) position. If there is no downstream equipment
connected, then the associated DIP switch section must be placed in the Terminated (DOWN) position. See below for a
diagram of termination settings. Note: Sections S2 and S4 are not used.
AES/EBU Input Connectors (Channels 1 and 2)
Only one of these two AES/EBU inputs may be monitored at a time. Selection between AES/EBU inputs 1 and 2 is accomplished
using the AES SOURCE Select Switch on the front panel (Item 10, page 12). Note that the unit will monitor the selected
AES/EBU channel only when the ANALOG/DIGITAL Source Select Switch on the front panel (Item 6, page 10) is set to
DIGITAL.
AMP2-DA (Standard): Utilizes two unbalanced (75 Ω) female BNC connectors accepting standard AES/EBU signals.
AMP2-DA/X (Option): Utilizes two balanced (110 Ω) 3-Pin female XLR connectors accepting standard AES/EBU signals.
AES 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.