Extron Electronics MPA 122 User Guide - Manual (Page 10)

MPA 122 • Installation and Operation MPA 122 • Installation and Operation
Installation and operation, cont’d
2-6
On the side mounting plates, devices are typically
mounted on the outside of the bracket. On the front
mounting plate, devices are typically mounted on the
inside of the bracket.
The front mounting plate is 1/4" taller than the side
plates. This size helps ensure the accessibility of buttons
or connectors.
3 . Affix the black rubber pad to the mounting plate.
4 . Place the U-bolt around the ceiling pole and insert the two
legs of the U-bolt through the slotted holes on the
bracket’s mounting plate and then through the slotted
holes on the backing brace.
For a typical (1.5" to 2.0" diameter) pole — The supplied
U-bolt fits a typical ceiling pole.
For a smaller or larger pole — Locally obtain a U-bolt that
fits the ceiling pole. The slotted holes on the bracket will
accommodate a U-bolt for pole sizes from 1.0" to 2.5" in
diameter.
5 . Secure the bracket to the U-bolt with the included hex
nuts, washers, and lock washers.
Rear Panel Features
POWER
12V
3A MAX
OUTPUTS
4/8 Ohms
INPUTS
L R L R
REMOTE
10V
VOL/MUTE
L
MPA 122
R
C US US
2 1 3 4 6 5
Figure 2-5 — MPA 122 back panel
Power input
1 Power connection — Plug the external 12 VDC power
supply into this connector. The power supply is included
with the unit.
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.
Connecting more than one input signal at one time will result in
audio mixing.
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.
2-7