Front Panel
Peak Indicator (PEAK)
The peak indicator lights when
the pre or post EQ signal level
reaches 3dB below clipping,
giving a visual reference for
optimum setting of the trim
control.
Foldback Control (FB)
The Foldback control determines
the level of signal assigned to the
foldback mixing buss, thus set-
ting the level of that channel in
the on-stage monitor mix.
High Equalizer Control
(HIGH EQ)
The high EQ control alters the
high frequency response of the
input channel, providing ±13dB
at 10kHz, and ±15dB at 20kHz of
continuously variable active
shelving equalization. The "0"
detented position provides flat
audio response.
Middle Equalizer Control
(MID EQ)
The mid EQ control provides
±15dB of continuously variable
active peaking equalization at
2kHz. and has a flat audio
response when set to the "0"
detented position.
Low Equalizer Control
(LOW EQ)
The low EQ control provides
±13dB at 100Hz and ±15dB at
50Hz of continuously variable
active shelving equalization.
The "0" detented position pro-
vides flat audio response.
Echo/Effects Control
(ECHO/EFF)
This control determines the
level of signal assigned to the
echo effects buss. Rotating the
control clockwise increases the
amount of echo effect in that
channel.
Input Level Control
(INPUT LEVEL)
The level control provides con-
tinuously variable adjustment
of the channel output of the
program mixing buss, thus deter-
mining the level of that channel
in the main sound system mix.
Since the echo/effects signal is
"post" this control, an increase
in the level of the channel's
output will also result in a cor-
responding increase in the echo
effect of that channel. The
nominal level of the input level
control is at the "10" position.
Input Trim Control (TRIM)
The input trim adjusts the gain
of the head-amp stage of the
associated channel, providing
39dB of gain control. When the
trim control is set to the "10"
position, the nominal input
levels of the low-Z and high-Z
inputs are —55dB and —35dB
respectively. At the "0" position
the levels are -16dB and +4dB.
The trim of each channel should
be adjusted so that the peak LED
just begins to light, or only
flashes occasionally. This will
ensure lowest distortion levels
and optimum signal to noise
ratio.
Foldback Master Control (FB)
The FB master control adjusts
the overall combined signal
level of the six independent
channel foldback sends, and
thus the level of the entire on-
stage monitor mix.
Echo/Effects to Foldback
Control (ECHO/EFF TO FB)
This control adjusts the amount
of echo/effects signal that is
returned to the foldback buss
and thus the level of echo/effects
contained in the on-stage moni-
tor mix.
Low Impedance Connectors
(LOW Z)
The XLR connectors are low
impedance, electronically bal-
anced inputs with an input
impedance of 1k ohms.
High Impedance Connectors
(HIGH Z)
These connectors are unba-
lanced, standard 1/4" phone
jacks with an input impedance
of 50k ohms, and an input level
of —35dB when the trim control
is set to "10". When a plug is
inserted into the high —Z input,
the corresponding XLR connec-
tor is automatically switched
out of the input circuitry.
Program Master Control
(PGM)
The PGM control adjusts the
overall combined signal level of
the six independent channel
level controls, and thus the level
of the main sound system.
Echo/Effects to Program
Control (ECHO/EFF TO PGM)
This control adjusts the amount
of echo/effects signal that is
returned to the program buss
and thus the level of echo/effects
contained in the main sound
system.
Aux Level Control (AUX)
This control sets the overall
level of the Aux input signal.
Patching Jack
(PATCH BAY/IN)
Patching Jack
(PATCH BAY/OUT)
Aux Panpot (AUX PAN)
This control assigns the auxili-
ary input signal (a tapedeck,
etc., connected to the aux input
jacks) to either the program or
the foldback mixing busses. At
the center position, the signal is
routed equally to both busses.
Panning from one side to the
other gradually assigns the sig-
nal to either independently.
Power Amp Compression
Indicator (COMP)
The Comp LED lights when the
internal compressor is acti-
vated.
The
compressor
is
provided to protect speaker
systems by compressing the
input signal level of the power
amplifier when clipping occurs
in the output stage. Frequent
flashing of the LED is not reason
for alarm. However, a constant
or steady light indicates that the
MX-106 is being overdriven and
that the internal power amplifier
is possibily "under powered" for
that application. The output
level of the MX-106 should be
decreased until the LED only
flashes intermittently.
Echo/Effects Send Control
(ECHO/EFF SEND)
This control adjusts the overall
signal level of the effects mix
that is delivered to the internal
echo unit, or to an external
effects device through the ef-
fects output. The send control
works in conjunction with the
Echo/EFF to PGM and the
Echo/EFF to FB controls to set
the overall level of echo/effects
in the main and monitor sound
systems.
Delay Time Control
(T1 DELAY)
The Tl control permits continu-
ously variable adjustment of the
echo time, from 10m seconds
(SHORT) to 100m seconds
(LONG).
Regeneration Control
(T2 REGEN)
The T2 control determines the
number of "repeats" of the
delayed signal from the internal
echo unit.
Graphic Equalizer
(EQUALIZATION)
The graphic equalizer is 1/1
octave with 9 independent ac-
tive bands (filters), providing
12dB of boost or cut at each
center frequency. The "0" de-
tented position provides flat
audio response.
Graphic Equalizer In/Out
Switch (IN/OUT)
The in/out switch enables com-
parison between a flat response
(out) and the equalized response
(in). The "out" position com-
pletely removes the equalizer
from the MX-106 circuitry.
Fluorescent Bargraph Peak
Meters (PGM/FB)
The high intensity meters enable
visual monitoring of the pro-
gram and foldback output signal
levels.
Power Amp Protection
Indicator (PROTECT)
The indicator LED lights if the
power amplifier output is short-
ed, if the temperature of the unit
rises above acceptable levels, or
if DC is drifted to the speaker
outputs. If the LED should light,
speaker wiring and ambient
temperature of the MX-106
should be checked. If the LED
remains lighted, the unit should
be referred to qualified service
personnel for repair.
Note:
The MX-106 protection circuitry
will (1) detect 'faulty conditions'
within the power amplifier, (2)
give a visual indication, and (3)
automatically shut down until
the fault condition is alleviated.
This special circuitry ensures
maximum reliability and virtu-
ally eliminates equipment dam-
age due to unsafe or fault
conditions. Please refer to fault
protection table on page 7 for
full explanation of this impor-
tant feature.
- 3 -
Buss Link Jack
(BUSS LINK)
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