Extron electronic MPA 181T Audio inputs, Remote control, Audio output, 6 - Power connector wiring

Installation and operation, cont’d

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.
Smooth	Ridges
A	A
	SECTION A–A
	0.2” (5 mm) MAX
	Power Supply
	Output Cord
	Captive Screw
	Connector

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.

2 RCA input connector — Plug an RCA audio source to this line level input.

3 3.5 mm stereo input — Plug a 3.5 mm audio micro cable into this stereo jack.

4Balanced 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				Balanced Output
Tip	LR	AUDIO	Tip	LR	AUDIO
See Caution			Ring
Sleeve (s)			Sleeve (s)
Tip			Tip
See Caution			Ring

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

5Remote 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.

6Output impedance toggle switch — A switch to toggle between a 70 volt or 4/8 ohm output.

Audio output

7Speaker connector — This 4-pin, 5 mm captive screw connector is used to connect the amplifier to the speakers.

Extron

SI 3CT LP

70V/100V/8 ohm Ceiling Speakers

181T

		MPA
		UTS
	OTE	OUTP
REM

	TS				70	V
INPU		10V	/MUT	E
(M	ONO)	VOL		R
		L

	L
POW	ER
	R

Extron

MPA 181T

Mini Power

Amplifier (70V)

Figure 2-8 — Typical speaker connection

2-8 MPA 181T • Installation and Operation MPA 181T • Installation and Operation 2-9