Extron Electronics MPA 152 Plus Setup Guide - Manual (Page 2)

2
MPA 152 Plus • Setup Guide (Cont’d)
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© 2013 Extron Electronics All rights reserved. www.extron.com 68‑1320‑52
Rev A 06 13
The MPA 152 Plus sums and weights the left unbalanced signals from the TRS and RCA receptacles. This summed,
unbalanced signal is then summed with the left balanced signal from the captive screw receptacle. The right channel is
handled in the same way.
The left and right channels are then sent to the output amplifiers in one of two ways, depending on how the
front panel switch is set (see the diagram to the right).
z
Stereo: The left and right channels are sent to the left and right output amplifers respectively.
z
Dual Mono: The left and right channels are summed and then the resulting mono signal is fed to both of
the output amplifiers.
NOTE: The captive screw, RCA and TRS inputs are buffered.
5. Connect the pre‑wired captive screw connector to one of the 2‑pole,
3.5 mm captive screw outlets on the provided 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. The MPA 152 Plus ships with a 24 W desktop power supply.
ATTENTION:
• See the attention notices in the Power Input section of the
MPA 152 Plus Series User Guide for important information
about using power supplies.
• When the power supply is connected to the MPA 152 Plus, it
must not be shared with any other devices.
6. Adjust the MPA 152 Plus input level, bass, and treble from the front panel (see figure at right).
a. If necessary, unplug the remote connector from the unit (see step 7, below).
b. If connecting the amplifier to a system with adjustable volume, set the system volume
to its lowest point. Then adjust the MPA 152 Plus front panel level potentiometer fully
counterclockwise.
c. Set the system volume to its maximum volume level (no sound should come out).
d. Return to the MPA 152 Plus 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.
e. Adjust bass and treble to preference.
7. The rear panel 3‑pole Remote captive screw port 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 152 Plus Series User Guide).
Power
Receptacle
DC Power Cord
Captive Screw
Connector
MPA 152 Plus
Amplifier
DC Power
Outputs
DO NOT USE
AC Power Cord
Tie
Wrap
Captive Screw
Connector
Power Supply
Output Cord
PS 1220
Power Supply
POWER
12V
0.7A MAX
V C G
10V 50mA
REM
OT
E
BASS LEVEL TREBLE
MINI POWER AMPLIFIER
MPA 152 PLUS
STEREO
DUAL
MONO