Audio Output - Extron electronics MPA 152 Plus User Manual

Audio Output

f
Speaker receptacle — This 4‑pole, 5 mm screw lock
captive screw receptacle is used to connect the amplifier
to the speakers.
With an 8 ohm load, the amplifier produces up to 8 watts
per channel. With a 4 ohm load, the amplifier produces up
to 15 watts per channel.
See the
connecting wires to captive screw connectors.
ATTENTION:
the amplifier.
Left
Right
Stereo/Dual Mono Switch
Figure 7. MPA 152 Plus Summing Diagram
Signal flow is as follows:
1. 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.
2.
The right channel is handled in the same way.
3. 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.
Stereo: The left and right channels are sent to the left and right output amplifers
•
respectively.
Dual Mono: The left and right channels are summed and then the resulting mono is
•
fed to both of the output amplifiers.
The captive screw, RCA, and TRS inputs are buffered.
attention (page 5) and note
Do not short the + and – outputs to each other, as this will damage
-
Captive
+
Screw
+
RCA
TRS
+
-
Captive
+
Screw
+
RCA
TRS
+
8
CLASS 2
WIRING
(page 5) for important information about
+
Stereo
+
+
+
+
Stereo
+
MPA 152 Plus • Panels and Cabling
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R
L
Dual
Mono
Amp Stage
9