© 2006 Wohler Technologies Inc. ALL rights reserved
12
AMP2A
and
AMP2A-2S
User Manual P/N
821553
Rev-
B
E
D
Please refer to Figure-2b on the following page to familiarize yourself with the rear panel features of the AMP2A and AMP2A-2S
units. The following sections describe these features and are referenced, by letter, to Figure-2b.
Rear Panel Features
Section 2: Operation
A
B
C
Power Connector
Attach a standard IEC-320 power cord between this connector and mains power (100 - 250VAC, 50/60 Hz). The front panel
Power Indication LED
(Item 2, page 10) will glow GREEN to indicate operating voltages are present.
Analog Input Connectors - Balanced XLR (AMP2A Only)
These two 3-pin female XLR connectors (
BALANCED IN, CHANNEL A (Left) and CHANNEL B (RIGHT)
) accept
standard analog audio signals and are configured for balanced 200K
Ω
connections. Pinout information for these connectors
is shown at bottom of this page.
Note:
For each input section
(CHANNEL A (Left)
or
CHANNEL B (RIGHT)
), you cannot connect analog sources
simultaneously to the unbalanced inputs (Item D) and these balanced inputs.
Analog Loop-Through Output Connectors (AMP2A Only)
These two 3-pin male XLR connectors (
LOOP-THRU, CHANNEL A (Left) and CHANNEL B (RIGHT)
) output an audio
loop-through of the signals entering the
Analog Input Connectors
(Item B). Both connectors are configured for low
impedance connections and the output signals are not affected by the volume/balance controls or headphone mute. Pinout
information for these connectors is shown at bottom of this page.
Analog Input Connectors - Unbalanced RCA (AMP2A Only)
These two female RCA connectors (
UNBALANCED IN, CHANNEL A (Left) and CHANNEL B (RIGHT)
) accept standard
analog audio signals and are configured for unbalanced 47K
Ω
connections. Pinout information for these connectors is
shown at bottom of this page.
Note:
For each input section
(CHANNEL A (Left)
or
CHANNEL B (RIGHT)
) You cannot connect analog sources
simultaneously to the balanced inputs (Item B) and these unbalanced inputs.
Analog Input Connectors - Balanced (AMP2A-2S Only)
All four of these 3-pin female XLR connectors (
SOURCE 1 or 2, CHANNEL A (Left) and CHANNEL B (RIGHT)
)
accept standard analog audio signals and are configured for balanced 200K
Ω
connections. Note that the
Source Select
Switch
on the front panel (Item 8, page 10) is used to select either
SOURCE 1
or
SOURCE 2
inputs for monitoring through
the AMP2-2S unit. Pinout information for these connectors is shown at bottom of this page.
Selected Output Connectors
These two 3-pin male XLR connectors are analog outputs of the
Analog Input Connectors
(Item E) as selected by the
Source Select Switch
(Source
1
or
2
) on the front panel (Item 8, page 10). 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 connector pinout
information see the diagram below.
F
High (+)
Low (-)
Gnd
(Shield)
Pin-1
Pin-2
Pin-3
Pin-1
Gnd
(Shield)
Pin-2
High (+)
Pin-3
Low (-)
Female XLR Pinout
Male XLR Pinout
Center
(Hot)
Sleeve
(Shield)
Female RCA
Phono Pinout
