Extron-electronics MPA 181T User Guide User Manual download pdf (Page 12)

MPA 181T • Installation and Operation

Installation and operation, cont’d

Balanced or unbalanced audio input connector — Marked “L”

and “R”, this 3.5 mm captive screw input is for bare wire,

balanced or unbalanced audio signals.

Unbalanced Output

Tip

See Caution

Sleeve (s)

Tip

See Caution

Balanced Output

Tip

Ring

Sleeve (s)

Tip

Ring

AUDIO

Figure 2-7 — 3.5 mm captive screw audio input

connector wiring

CAUTION

Connect the sleeves to ground (Gnd). Connecting

the sleeve to a negative (-) terminal will damage the

audio output circuits.

Remote control

Remote input connector — An optional 5-pin, captive screw

connector that allows a wall mounted audio controller or

MediaLink product to remotely control volume and mute levels

for the MPA 181T unit.

For more information on using the remote input connector, see

Chapter 3, Remote Operation.

Output impedance toggle switch — A switch to toggle between

a 70 volt or 4/8 ohm output.

Audio output

Speaker connector — This 4-pin, 5 mm captive screw connector

is used to connect the amplifier to the speakers.

UTP

INP

(

)

(

)

MPA 181T

Extron

SI 3CT LP

70V/100V/8 ohm

Ceiling Speakers

Extron

MPA 181T

Mini Power

Amplifier (70V)

Figure 2-8 — Typical speaker connection

2-9

To verify the polarity before connection, plug in the power

supply with no load and check the output with a voltmeter.

CAUTION

When connecting the power supply, voltage polarity

is extremely important. Applying power with

incorrect voltage polarity could damage the power

supply and the interface. Identify the power cord

negative lead by the ridges on the side of the cord.

Power Supply

Output Cord

Captive Screw

Connector

0.2” (5 mm) MAX

SECTION A–A

Ridges

Smooth

A A

Figure 2-6 — Power connector wiring

Do not tin the stripped power supply leads before

installing the captive screw connector. Tinned wires are

not as secure in the captive screw connectors and could

pull out.

The two power cord wires must be kept separate

while the power supply is plugged in. Remove

power before continuing.

Audio inputs

There are three choices of input connectors (RCA, 3.5 mm

stereo, and captive screw) available on the rear panel for

adapter-free connections.

All inputs are actively mixed together then summed into a

mono signal.

RCA input connector — Plug an RCA audio source to this line

level input.

3.5 mm stereo input — Plug a 3.5 mm audio micro cable into

this stereo jack.

2-8

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Extron-electronics MPA 181T User Guide User Manual Page 12

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