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Audio connections, Audio.connections, Preliminar y – Extron Electronics MVX Plus 128 VGA A User Guide User Manual

Page 22: Installation, cont’d

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Installation, cont’d

MVX Plus 128 VGA A Matrix Switcher • Installation

2-4

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 Ethernet or 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”, chapter 5, “Matrix Software”, and chapter 6, “HTML Operation” for

details.

c

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 2-2 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 2-2 — 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 2-3 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 2-2 and figure 2-4.

Tip (+)

Sleeve ( )

Sleeve ( )

Ring (-)

Tip (+)

RCA Connector

3.5 mm Stereo Plug Connector

(balanced)

Figure 2-3 — Typical audio connectors

The audio level for each input can be individually set via the front panel

or Ethernet or RS-232/RS-422 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”, chapter 5, “Matrix Software”, and chapter 6, “HTML

Operation” for details.