Instruction Manual
Roemtech PMA-245
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List of Contents
1. Plenum Rated Stereo
Mixer/Amplifier - 40watts
2. Regulated 48watt Power Supply
(Not Plenum Rated)
3. Universal 5’ Power Cord
(Not Plenum Rated)
4. Mounting Hardware
5. Pair of Wire Nuts
6. Detachable Terminal Block
(x 2)
Typical Bridged
Mono Wiring Diagram
Right
Rear
Speaker
Right
Front
Speaker
-/+
-/+
-/+
-/+
Left
Rear
Speaker
Left
Front
Speaker
RCA STEREO
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INPUT 1
This setup provides bridged
mono audio. All speakers
receive L and R audio signals.
Note: Attach R+ and L- for one channel
and R- and L+ for the other.
PWR
+/-
+/-
PMA-245
INPUT 2
3.5 MM
STEREO
SPEAKERS
+ L - + R -
To Power Supply
(Power connections are
polarity tolerant at amp.)
Typical Stereo
Wiring Diagram
Right
Rear
Speaker
Right
Front
Speaker
-/+
-/+
-/+
-/+
Left
Rear
Speaker
Left
Front
Speaker
RCA STEREO
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INPUT 1
INPUT 2
3.5 MM
STEREO
This setup provides
true stereo seperation
SPEAKERS
+ L - + R -
PWR
+/-
+/-
PMA-245
To Power Supply
(Power connections are
polarity tolerant at amp.)
Standard Classroom
COMPUTER IN
RCA AUDIO
COMPOSITE VIDEO
L R
Computer 2
COMPUTER AUDIO
Standard Wall Plate
110v Plenum
Power Box
3.5mm to 3.5mm Stereo Cable
(Goes from Projector’s Variable Audio
Out, Directly to Plenum Amplifier)
Plenum Rated
45 Watt Amplifier
3.5mm to 3.5mm Stereo Cable
(This Cable Comes From Projector’s
Variable Audio Out to Amp’s Input #2)
Power Supply for
Plenum Amplifier
(Fastened to Projector Mount)
110v Power Cables
to Ceiling Outlet
18v Power Cable
from Power Supply
3.5mm to RCA Stereo Cable
(Goes from Amplifier Input #1
Directly to the Wallplate)
Speaker Wires to
Stereo Speakers
These Cables are
Routed through the
Pipe to the Wall Plate
Frequently Asked Questions:
1 2 3 4 5 6 7 8 9 10 11 12 13 14
A
B
C
D
E
F
G
H
I
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Projector Installation
Q: Is the power supply plenum rated?
A: No, only the amplifier is plenum rated,
to maintain plenum approval, the
power supply should be mounted below
the plenum area as shown in the picture.
Q: What are the wire nuts for?
A
A: In strict plenum installations, the wire
nuts can be used to make a splice from
the power supplies 18V (non plenum
B
rated) wire to plenum rated speaker wire
(18AWG or thicker).
The splice typically resides in the pipe.
C
Q:What ohm level can the amplifier
tolerate?
A: The amplifier is designed to easily
D
support 4 ohm loads.
This means that you can attach as
many as four, 16 ohm speakers per
channel for a total of eight speakers
E
per amp, or two 8 ohm speakers per
channel for a total of 4 speakers.
Q: Why are there +/- marks over both
F
power connections?
A: The +/- marks are to indicate that the
amplifier is polarity tolerant. In other
G
words, it is impossible for the power
supply to be hooked up backwards.
In addition, since the power supply is
H
regulated it will shut down if it is over loaded or shorted out. Once the over load is removed, the power supply will
resume its normal operation.
I
Q: Will the amplifier overheat if it is put in
the plenum area in hot climates?
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A: No, the amplifier is specifically designed
for high-temperature applications. The
massive heat-sink dissipates heat very
well, even in the most extreme conditions.
However, you should use care not to cover
the amplifier with insulation.
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