Manual-8
controls. Modifying the sound of the mic in this way won't
affect the EQ of the music in the system. The two Equalizer
sections (Mic and Program) are totally independent. When the
microphone is not in use, release the MIC ENGAGE switch
again to its upward position. When the switch is down, the red
LED flashes. When off, the LED will be out. If the micro-
phone preamp becomes overloaded, the red LED OverLoad
light illuminates. If this is a problem, lower the appropriate
MIC LEVEL control and increase the level of the MASTER
LEVEL fader to restore desired microphone level.
MONO OPERATION
There may be situations where a mono output signal is
preferable to a stereo output. If this is the case, mono outputs
may be obtained on all of the Outputs (Master, Booth, Zone)
by engaging the SYSTEM MONO switch on the rear panel.
When engaged, the SYSTEM MONO switch sums the Left
and Right buses together. In this situation, if only one of the
stereo Inputs on any of the three Phono or six Line sections is
driven, the applied signal appears in equal quantities at both
Left and Right OUTPUT connectors.
USING THE LIGHTING CONTROL OUTPUT
The mono LIGHT CONTROL OUTPUT allows use of
lighting systems designed to be triggered from an audio
source. A LIGHT OUTPUT LEVEL control adjusts the
output level appropriate for the lighting controller. There
appears to be a wide variety of sensitivities in different brands
of controllers, therefore some adjustment is likely required. In
the full CW position of the LIGHT OUTPUT LEVEL control,
the signal delivered is amplified 20 dB relative to the pre-
master fader level. If this is excessive, CCW rotation of the
LIGHT OUTPUT LEVEL control decreases the drive
amount. None of the Level controls past the Input Channel
faders affect this drive level.
BOOTH AND ZONE OUTPUTS
The ZONE OUTPUT is an additional Stereo Output with
it’s own ZONE LEVEL control that can be routed to an
amplifer that feeds the bar, another tape recorder, etc. This
output is Post-EQ, which means also that the mic is heard
from the Zone Outputs along with any Program EQ changes
(This can be changed with an internal jumper block). The
BOOTH OUTPUT operates much the same way, with an
added feature: When the ENGAGE MIC switch is activated,
the gain of the BOOTH OUTPUT “ducks” down 13.5 dB to
prevent feedback from the booth speakers. If this Output is
used for something else and this feature is undesired, a
BOOTH DUCKER DEFEAT switch is provided on the rear
panel. Be sure this switch is in the ACTIVE position if booth
speakers are used.
SOME FURTHER HINTS
Set the Input Channel faders near their maximum levels to
preclude required excessive gain from the Output stage.
Optimum noise performance is achieved by running the
majority of the gain on the Input stages. Taking the least
amount of gain on the Output stage ensures that the system
doesn’t have to amplify the unavoidable noise generated by
the input buffers and summing amplifiers.
IMPORTANT NOTE
CHASSIS GROUNDING
The MP 24 is supplied with a rear mounted ground-lift
switch. The unit is shipped with this switch in the
“grounded” position, tying circuit ground to chassis
ground. If after hooking up your system it exhibits
excessive hum or buzzing, there is an incompatibility in
the grounding configuration between units somewhere.
Here are some things to try:
1. Try combinations of lifting grounds on units that
are supplied with ground lift switches or links.
2. If your equipment is in a rack, verify that all chassis
are tied to a good earth ground, either through the line
cord grounding pin or the rack screws to another
grounded chassis.
3. This units outboard power supply does NOT ground
the chassis through the line cord. Make sure that this unit
is grounded either to another chassis which is earth
grounded, or directly to the grounding screw on an AC
outlet cover by means of a wire connected to a screw on
the chassis with a star washer to guarantee proper contact.
Please refer to RaneNote “Sound System Interconnec-
tion” (supplied with this manual and available on request
at no charge separately) for further information on system
grounding.
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com
