© 2006 Wohler Technologies Inc. ALL rights reserved
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VMDA Series User Manual P/N 821115 Rev-C.5
Please refer to Figure-1b on the following page to familiarize yourself with the rear panel connectors and settings of the
VMDA series units. The following sections describe the functions of each of the various connectors and settings found on the
rear panel and are referenced, by letter, to Figure-1b.
A Power Connector
Attach a standard IEC-320 power cord between this connector and mains power (100 - 240VAC nominal, 50/
60 Hz). The front panel power LED will glow green to indicate an operating voltage is present.
B Analog Output (Left and Right) - Phoenix (Mini-Combicon) Connector
This Phoenix style, Mini-Combicon, dual vertical, 6-position terminal block connector outputs the currently
selected left and right channels as monitored from the left and right speakers (or headphone). The top three
positions are the left output; bottom three positions are the right output.
C AES Inputs (1 - 4) - Phoenix (Mini-Combicon) Connectors
VMDA-4:
These Phoenix style, Mini-Combicon, dual vertical, 6-position terminal block connectors receive
standard AES/EBU digital signals. There are a total of four (4) inputs; two on the first connector and two on the
second connector, and are labeled AES 1, AES 2, AES 3, and AES 4.
VMDA-1:
This Phoenix style, Mini-Combicon, 3-position terminal block connector receives standard AES/
EBU digital signals. There is one of these inputs, labeled AES 1. This mini-Phoenix connector is configured
as a 110 Ohm balanced input.
D AES Inputs (1 - 4) - BNC Connectors
VMDA-4:
These panel mounted BNC connectors receive standard AES/EBU digital signals. There are a total
of four (4) inputs. Inputs are labeled AES 1, AES 2, AES 3, and AES 4. These BNC connectors are configured
as 75 Ohm unbalanced inputs.
VMDA-1:
This panel mounted BNC connector receives standard AES/EBU digital signals. There is one input,
labeled AES 1. This BNC connector is configured as a 75 Ohm unbalanced input.
E Termination Settings for AES Inputs - DIP Switch Modules
These DIP switches set the termination characteristics of the AES/EBU inputs. In the event that signals entering
the AES Inputs 1, 2, 3, and/or 4 are chained to other equipment that come
after
the VMDA unit, then the
respective DIP switch should be set to “unterminated”. If there is no signal chaining after the VMDA, then the
respective DIP switch should be set to “terminated”.
VMDA-4:
There are two DIP switch modules; one for the AES 1 and AES 2 termination settings, and a second
DIP switch module for the AES 3 and AES 4 termination settings. Each DIP switch has two sections (switches),
which set the termination for the associated input; Term. 1 for AES 1, Term. 2 for AES 2, Term. 3 for AES 3,
and Term. 4 for AES 4. The switches are set in the down position for terminated and up for unterminated.
VMDA-1:
There is only one DIP switch module with one active section (switch), which sets the termination
for the single AES input. Use the section on the left of the DIP switch module (the one on the right is not used).
The switch is set in the down position for terminated and up for unterminated.
F Analog Inputs (1 - 4) - Phoenix (Mini-Combicon) Connectors
These Phoenix style, Mini-Combicon, dual vertical, 6-position terminal block connectors receive standard
analog stereo signals. On the VMDA-4, there are a total of four (4) connectors while on the VMDA-1 there is
one connector. Each connector has two inputs, with three positions per input. For each connector, the top three
positions are the left input; the bottom three positions are the right input. These mini-Phoenix connectors are
configured as 110 Ohm balanced inputs.
REAR PANEL CONNECTORS AND SETTINGS
