Installation and operation, cont’d
4/8 ohm output | 70 volt output | ||||||||||||||
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| COM 70V |
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| COM 70V | ||||||
70V |
| 70V |
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4/8 OHM | + - | 4/8 OHM | + - |
+ | COM 70V |
Figure 2-9 — Output speaker wiring
The 70 volt output and the 4/8 ohm output cannot be used simultaneously.
Front Panel Features
ON | LEVEL | BASS | TREBLE |
1 | LIMITER |
OFF |
MPA 181T
MINI POWER AMPLIFIER
23
Figure 2-10— MPA 181T front panel
1Power LED — A green LED lights to indicate that the unit is receiving power.
2Limiter toggle switch — When the limiter is switched to “On”, the MPA will automatically reduce the level to prevent the amplifier from clipping.
3Potentiometer adjustments — These three potentiometers optimize level, bass, and treble adjustments.
Setting Up the MPA 181T Amplifier
When setting up volume control, ensure that the projector output is set to variable out. Consult the projector’s user manual for detailed instructions on its calibration.
To adjust the MPA 181T input level, bass, and treble, do the following:
1.If connecting to a projector, ensure that the volume on the device is at its lowest point, then adjust the level of the MPA 181T fully counterclockwise.
2.Set the projector volume to its maximum volume level. No sound should come out.
3.Return to the MPA and raise the level until sound distortion occurs, then lower the level slightly until any distortion disappears. This setting ensures that, whatever the projector volume setting may be, no clipping occurs.
4.Adjust bass and treble to preference.
Remote connector wiring
Options for remote control include the Extron VCM 100 and VC 50 volume controllers. Third party 10k potentiometer volume controllers can also be connected to this port.
As shown below, Pin 1 is 10 VDC reference voltage. Pin 2 is volume control DC voltage; range is 0 to 10 V, where 0 V is mute and 10 V provides maximum volume. Pin 3 is ground.
All nominal levels are at ±10%.
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| Extron |
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| Black |
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REMOTE |
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| Ground |
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1 | 2 | 3 |
10V | VOL/ MUTE | 10V |
VOL/MUTE |
VOLUME
MUTE
VCM 100
Figure 2-11— Pinout diagram for VCM 100 MAAP remote connector
| MPA 181T • Installation and Operation | MPA 181T • Installation and Operation |