Extron Electronics MVX VGA A User Guide - Manual (Page 20)

2-5 MVX VGA A Matrix Switchers • Installation
PRELIMINAR
Y
Audio connections
By default, the audio ties follow the video ties. Audio breakaway, which can be
activated via the front panel or under serial port control, allows you to select from
any one of the audio input sources and route it separately from its corresponding
video source. See chapter 3, “Operation”, chapter 4, “Programmer’s Guide”, and
chapter 5, “Matrix Software”, for details.
d
Connections for balanced and unbalanced audio inputs — Each input has
a 3.5 mm, 5-pole captive screw connector for balanced or unbalanced stereo
audio input. Connectors are included with each switcher, but you must
supply the audio cable. See figure 2-4 to wire a connector for the appropriate
input type and impedance level. Use the supplied tie-wrap to strap the audio
cable to the extended tail of the connector. High impedance is generally over
800 ohms.
L
R
L
R
Unbalanced Stereo Input Balanced Stereo Input
(high impedance) (high impedance)
Do not tin the wires!
Ring
Sleeve (s)
Tip
Sleeve
Tip
Sleeve
Tip
Tip
Ring
Figure 2-4 — Captive screw connector wiring for audio inputs
C The length of the exposed (stripped) portion of the copper wires is
important. The ideal length is 3/16” (5 mm). Longer bare wires can
short together. Shorter bare wires are not as secure in the direct insertion
connectors and could be pulled out.
C The captive screw audio connector can easily be inadvertently plugged
partially into one receptacle and partially into an adjacent receptacle. This
misconnection could damage the audio output circuits. Ensure that the
connector is plugged fully and only into the desired input or output.
N See figure 2-5 to identify the tip, ring, and sleeve parts of the connector when
you are making connections for the switcher from existing audio cables. A mono
audio connector consists of a tip and sleeve. A stereo audio connector consists
of a tip, ring, and sleeve. The ring, tip, and sleeve wires are also shown on the
captive screw audio connector diagrams, figure 2-4 and figure 2-6.
Tip (+)
Sleeve ( ) Sleeve ( )
Ring (-)
Tip (+)
RCA Connector
3.5 mm Stereo Plug Connector
(balanced)
Figure 2-5 — Typical audio connectors
The audio level for each input can be individually set via the front panel or
serial port control to ensure that the level on the output does not vary from
input to input. See chapter 3, “Operation”, chapter 4, “Programmer’s Guide”,
and chapter 5, “Matrix Software”, for details.