Extron electronic MVX PLUS 128 Audio connections, Captive screw connector wiring for audio inputs

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 RS-232/RS-422 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, Switcher Software, and chapter 6, HTML Operation for details.

cConnections 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. High impedance is generally over 800 ohms.

Tip Sleeve

Tip Sleeve

Tip

Ring

Sleeve (s)

Tip

Ring

600 ohms

Tip

Ring

Sleeve (s)

Tip

Ring

		600 ohms
Unbalanced Input	Balanced Input	Balanced Input
(high impedance)	(high impedance)	(600 ohms)

Figure 2-2 — Captive screw connector wiring for audio inputs

CThe 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.

NSee figure 2-3 to identify the tip, ring, and sleeve when you are making connections for the switcher from existing audio cables. A mono audio connector consists of the tip and sleeve. A stereo audio connector consists of the 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 ()

Tip (+)

Ring (-)

Sleeve ()

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, Switcher Software; and chapter 6, HTML Operation for details.

MVX Plus 128 VGA Matrix Switchers • Installation 2-3