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MPA 401-70V • Cabling
d
Balanced or unbalanced audio input connector — This 5-pole 3.5 mm captive
screw connector accepts line level, balanced or unbalanced, mono or stereo audio
signals. See the notes on page 2-2 for important information about connecting
wires to captive screw connectors.
C
Connect the input wires to the correct terminal. Connecting the ground
wire ( ) to a negative (-) terminal will damage the audio output circuits.
e
Remote input connector — 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 2-2 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
and instructions below:
• Pin 1 is 10 VDC reference voltage.
• Pin 2 (VOL/MUTE) has two functions:
o 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.
o It can be used for remote control muting. Sound is muted while the mute
pin is shorted to ground.
• Pin 3 is ground.
N
All nominal levels are at ± 10%
More information about remote control of the MPA 401-70V can be found on page 3-3.
f
Speaker connection — Connect the speakers to this socket using the 2-pole, 5 mm
screw-lock captive screw connector.
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, which provides up to 40 W for a 70 V line distributed sound system.
See the notes on page 2-2 for important information about connecting wires to
captive screw connectors.
C
Do not short the + and - outputs to each other or to the ground ( ) as this
will damage the amplifier.
REMOTE
VOL/MUTE
10V 50m
A
GND
Volume Pot
10K Ohms
2K
Vol/Mute
10 V
Mute
Switch
OUTPUT
70V