Remote – Extron Electronics MPA 401 Series Setup Guide User Manual

Page 2

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

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www.extron.com

68-1436-50
Rev C 05 13

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.

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
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.

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

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

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.

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

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.

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.

BASS

LEVEL

TREBLE

MINI POWER AMPLIFIER

MPA 401

Power Receptacle

DC Power Cord
Captive Screw Connector

MPA 401 series

Amplifier

DC Power

Outputs

AC Power Cord

Tie

Wrap

Captive Screw

Connector

Power Supply

Output Cord

36 W Power Supply

12V

1.5A MAX

INPUTS

(MONO)

(SUMMED)

INPUTS

V C G

10V

50mA

REMOTE

VOL/MUTE

10V

50mA