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Remote Input Connector
e Remote input connector (see gure 2) — This 3-pole captive screw connector
allows the option of using a wall-mounted audio controller or MediaLink product to
control volume and mute levels remotely.
Options for remote control include the Extron VC 50, VCM 100 AAP, VCM 100 MAAP,
or MLA VC10. Third party 10k potentiometer volume controllers can also be
connected to this port. See the notes on page 4 for important information about
connecting wires to captive screw connectors.
Wire the remote control connector to the
VCM 100 MAAP as shown in the figure at right
and instructions below:
z Pin 1 is 10 VDC reference voltage.
z Pin 2 (VOL/MUTE) has two functions:
z It can be used as a variable voltage input. The volume control DC voltage
range is 0 to 10 V, with 0 V giving full attenuation and 10 V giving maximum
volume.
z It can be used for remote control muting. Sound is muted while the mute pin
is shorted to ground.
z Pin 3 is ground.
NOTE: All nominal levels are at ± 10%
More information about remote control of these amplifiers can be found on page 9.
Speaker Connections
f Speaker connection (see gure 2) — Connect the speakers
to this socket using the 2-pole, 5 mm screw-lock captive screw
connector (shown at right).
The three left channel inputs (RCA, TRS and captive screw)
are summed to form Left Sum, with weightings proportional to their respective
sensitivities. Similarly the three right channel inputs are summed to form a Right Sum.
Left Sum and Right Sum are mixed and amplified to provide one high voltage, mono
output. The MPA 401-70V provides up to 40 W for a 70 V line distributed sound
system; the MPA 401-100V provides up to 40 W for a 100 V line distributed sound
system.
See the notes on page 4 for important information about connecting wires to
captive screw connectors.
CAUTION: Do not short the + and - outputs to each other or to ground ( ) as
this will damage the amplifier.
OUTPUT
70V
GND
Volume Pot
10K Ohms
2K
Vol/Mute
10 V
Mute
Switch
MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 6