Manual-7
N108
POWER
100-240V
20 WATTS50/60 Hz
FOR CONTINUED
GROUNDING
PROTECTION DO
NOT REMOVE
SCREW
POWER
The IEC appliance input jack is connected to AC mains using a line cord appropriate for
your area. The high efficiency switching power supply used in the MP 44 operates at voltages
from 85 VAC to 250 VAC, 50 or 60 Hz. To prevent accidental shutoff during the height of the
show, there is no front panel power switch. When applying power to the system, remember to
turn power amplfiers on last.
WARNING: DO NOT OPERATE THIS UNIT WITHOUT THE LINE CORD EARTH
GROUND CONNECTED. TO DO SO MAY INCREASE THE RISK OF ELECTRIC SHOCK
and INCREASE LINE CORD CONDUCTED EMISSIONS.
OPTIONAL VR 1 REMOTE LEVEL CONTROL
The REMOTE LEVEL input jack is a 3-pin Euroblock connector. If no connection is
made, the gain is unaffected. The Vr pin provides a precision voltage reference. The Vc pin
receives the VCA (voltage controlled amplifier) control voltage. The third pin provides a
ground reference for the port. To use the VR 1 Remote Control, simply connect like labeled
pins together.
To build your own remote control, use a linear taper potentiometer with a resistance of 1k
ohms to 100k ohms. Connect ground to the CW terminal of the potentiometer. Connect Vc to
the center wiper of the potentiometer. Connect Vr to the CCW terminal of the potentiometer.
Another option is to use an external, ground referenced control voltage with a range of 0 to
+5 volts. The gain control law is 125 mV/dB (for each 125 mV applied to the Vc pin, the audio
is attenuated by 1 dB).
The best option might be to use Rane's ready-to-go remote, the VR 1.
EUROBLOCK CONNECTIONS
When wiring to Euroblocks, a minimum wire gauge of 22 is preferred for reliability. If the
ground or shield wire is left shorter, it acts as a strain relief for the other wires. Cable with a
flexible jacket is easier to use and less likely to damage the connections. Avoid stripping
excess insulation. Inspect wires for nicks that may lead to wire breakage. Fully insert each wire
in the appropriate socket and tighten the screw.
You may use 3-conductor unshielded remote control signal cable for shorter runs (less than
200 ft.) or 4-conductor (2 pair) shielded remote control signal cable (use the shield as the GND
return) for longer runs (200 to 1000 ft.). The type of wire required is influenced by your
installation and local electrical codes.
REMOTE INSTALLATION
Turn the power to the MP 44 off until all connections are made. It is important to ensure
that the Remote Ports are not subjected to sustained voltages outside the range of 0 to 5 volts
DC or high levels of static. Inputs are protected, however, caution is the better part of... you
know. It is a good idea to install the wiring, connect it to the Remote and then make the final
connections at the MP 44. Do not short the Vref pin to ground. This pin is current limited,
however, excess heat is generated in the 5 volt supply if a short occurs. Never subject the Vref
pin to voltages above 5 volts.
VR 1 REMOTE MOUNTING
The VR 1 remote assembly mounts in a standard U.S. electrical box with a minimum depth
of 2.25" (5.5 cm). Be sure to note the wire color of each input in order to facilitate correct
wiring to the MP 44. Connect each wire to the 3-pin connector by fully inserting it in the
correct socket and tightening the screw. Make sure wires are free of nicks and that the cable
jacket is stripped back sufficiently to allow it to lie in the electrical box with the remote
assembly inserted. Use the flat head #6 screws supplied with the kit to mount the remote
assembly and silk-screened front panel to the electrical box (see above diagram). Note the
“UP” arrow screened on the printed circuit board of each remote (mount it pointing up).
The silk-screened front panel metal is painted on both sides. This allows you to custom
silk-screen the panel or add your own custom decals. Simply install the modified front panel
with your art facing out, and you are in business!
REMOTE
LEVEL
VcVr
