How to get a good mix
Before connecting other equipment to the Powered mixer, check the impedance and
level of both. If the impedances and levels do not match, mixing will be very difficult
and the S/N ratio will also be adversely affected.
Each input channel of the MX-106 is provided with a TRIM control. Thorough
understanding of the function of a TRIM control will make mixing easier.
Trim Control
Input
The function of the TRIM control is to
control the negative feedback volume of the
head-amp so that the gain of the head-amp
can also be changed. Bacause of this, enough
dynamic range, even for high level signals is
ensured. Also, the S/N ratio will be better by
decreasing the gain of the head-amp.
For example, a keyboard, a musical instrument and a dynamic microphone with
output levels of –10dBm, –20dBm and –40dBm respectively are connected to the MX-
106.
If the trim control is set as shown in the left
figure, the input level controls can be set to
the same position.
The input level controls are used in general
between 6 and 8.
The peak indicator LED illuminates if the
head amplifier or equalizer is clipping. The
gain of the head-amplifier must be decreased
by turning the trim control counterclock-
wise.
Key Board in
-10dBm level
Musical Instrument in
20dBm level
Dynamic
Microphone in
-40dBm level
Fault Protection Table
Fault
Excessive current due to
overloads.
Short circuits
(less than 0.4-ohm)
Temperature rise of heat
sink
(more than 105°C)
DC drift
Protection
Current limiter activates at
less than 1 ohm.
Current limiter activates,
input signal is lowered,
unit shuts down,
Input signal is lowered.
Unit shuts down.
Input signal is lowered.
Unit shuts down.
Indication
Compressor
LED illuminates.
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Action
Remove excessive lords.
Minimum speaker loads 2-
ohm.
Check speaker
lines/systems for shorts.
Check for adequate
ventilation.
Refer to qualified service
personnel.
Restoration
Automatic restoration
after normal loads are
obtained.
Turn off power switch.
Turn on into operational
loads.
Automatic restoration
after temperature
lowers (to 75° - 95° C)
Automatic restoration
after normal bias is
regained.
Output
– 7 –
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