Extron electronic setup guide MPA 401-70V and MPA 401-100V Setup Guide Cont’d, Remote

MPA 401-70V and MPA 401-100V • Setup Guide (Cont’d)

NOTES:

• The input receptacle may be labeled in one of two ways: the ground pins of the input connector port may be labeled or (see the images to the right). The wiring and function are the same whichever way the product is labeled

• The MPA 401 amplifier sums the left and right signals from both the TRS and RCA inputs to form Sum 1. Sum 1 is then weighted. At the same time, the amplifier sums the left and right signals from the captive screw input to form Sum 2. Sum 1 and Sum 2 are then summed together to form a single mono signal. See figure 6 on page 9 of the MPA 401 Series User Guide for more details.

• The captive screw, RCA and TRS inputs are buffered.

Ensure that the audio output of the projector is set to variable out. Multiple input options can be used simultaneously and result in summing.

L

(SUMMED)

L(SUMMED) R

R

INPUTS

INPUTS

L (MONO)

R

L (MONO) R

Step 5 — Connect power cords to the MPA 401 and other audio equipment. The MPA 401 ships with an Extron 36 W desktop power supply.

Connect the pre-wired captive screw connector into one of the two pole,

3.5 mm captive screw outlets on the power supply and the other end into

MPA 401 series	36 W Power Supply
Amplifier
	AC Power Cord
Power Receptacle
	DC Power
	Outputs

the power receptacle on the amplifier (see the figure to the right). The

power cord connectors are correctly wired when shipped.

ATTENTION:

•See the attention notices in the Power Input section of the

MPA 401 Series User Guide for important information about using power supplies.

•When the 36 W power supply is connected to the MPA 401, it must not be shared with any other devices.

12V

1.5A MAX

DC Power Cord

Captive Screw Connector

Tie

Wrap

Captive Screw Connector

Power Supply

Output Cord

Step 6 — Adjust the MPA 401 input level, bass, and treble from the front panel (see figure at right).

1.If necessary, unplug the remote connector from the unit (see step 7, below).

2.If connecting the amplifier to a system with adjustable volume, set the volume to its lowest point. Then adjust the MPA 401 front panel level potentiometer fully counterclockwise.

LEVEL BASS TREBLE

MPA 401

MINI POWER AMPLIFIER

3.Set the system volume to its maximum volume level (no sound should come out).

4.Return to the MPA 401 and raise the level until sound distortion first occurs, then lower slightly until the distortion disappears. This setting ensures that, whatever the system volume setting may be, no clipping occurs.

5.Adjust bass and treble to preference.

Step 7 — The rear panel 3-pole Remote captive screw receptacle on the amplifier can be used for remote control of the volume by an Extron volume controller such as an Extron VCM 100 AAP, VC 50, or MLA VC10 Plus. A MediaLink controller can also adjust the audio volume via a network connection or by IR remote (see the MPA 401 Series User Guide).

NOTE: Control signal ground pins may be labeled as	or “G.” The wiring and function
are the same, whichever way the product is labeled.

REMOTE		10V		50mA
10V	50mA		VOL/MUTE

V C G REMOTE

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	Rev C 05 13

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