Controls And Functions; Output Connection - Master audio DJ842 User Manual

2-CONTROLS AND FUNCTIONS

Input Section
Some channels have two Inputs for
Phono/RIAA/Cd or Line Sensitivity,
accessible by switch-button. There is
another independent input for Balanced
Microphone which, in turn, includes anti-
pop filter.
All the inputs are subject to a GAIN
control, which allows reaching +6dB
Sensitivity over the original input.
For equalizing, there are three tone controls
for HIGH (12kHz), MID (1kHz) and LOW
(80Hz) frequencies with a dynamic margin
of +12/-26 dB.
The PFL push-button sends the selected
channel signal directly to the Premonitoring
section (HEADPHONES).
CLIP: When the red Led is lighted on the
Led Bar, it warns about the existence of
Distortion due to an overload of the input
level in each channel. If it lights up (either
blinking or permanently lit), the input level
must be reduced using GAIN.
WARNING: This is the most controversial
adjustment among those that can be made
on any professional mixer. Its good
"management" will later influence the
correct operation and the sound quality of
the reproducing components connected
afterwards.
FADER. Each channel has a sliding
potentiometer of great quality, with a
45mm travel.
The PCBs include fibber glass support.
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Control and Output Section
CROSSFADER. The Crossfader quick mix
unit allows efficient mixing between
channels. This unit includes its own circuit
and a 45mm potentiometer, thus enabling a
quick, safe external change, without the
need of interrupting the work session
whenever a fault due to wear or breakage is
detected in this extremely punished mixing
element.
Regarding the outputs, there are various
possibilities:
OUTPUT option used as general program
output. It is electronically balanced by
using specific audio (XLR-3) integrated
elements, a MONO/Stereo switch (M1262)
and Balance Control (BAL -L/R-). The
potentiometers are from the same
characteristics as the ones described in the
previous section.
The socket for the Headphones
(HEADPHONES), with its volume control
allows the appropriate checking of the
Previous and Final musical program.
Finally there is a Recording (REC) output.
The duly calibrated VU-Meter, with 10
Leds per channel, gives quickly
information on the output (PGM), with
excellent accuracy.
POWER. An oscillating switch connects
the power from the general mains supply
(230V).
3-SOURCE CONNECTION (Inputs)
For the connection of sound reproducers for
Cassette tapes, CDs, Videos, Tuners,
Electronic Musical Instruments, Wireless
Microphone Receptors, etc..., the inputs
defined as LINE inputs must be used.
These inputs have a nominal sensitivity of
200mV. All the connections are made using
RCA connectors (White for the Left
channel and red for the right channel).
For the connection of Turntables, the inputs
defined as PH must be used exclusively.
These inputs include the required RIAA
equalization by selecting the corresponding
switch. RCA connectors must also be used.
Furthermore, there is a Grounding (GND)
option to be used with Turntables.
Warning: The Red/White polarity must be
respected at all times in order to correctly
maintain the Balanced Phase of the Stereo
effect.
To connect dynamic microphones use the
inputs equipped with a XLR-3 connector,
while maintaining the polarity defined by
the manufacturer (Pin 1:ground; Pin 2:+,
Pin3:-).
The use of the Micro mode automatically
implies the connection of a (subsonic)
Filter that will eliminate the lowest
frequency band (Anti-Pops). Do not forget
that wireless Microphones (Receivers)
should ordinarily be treated as Line. For the
Input Level control of each source
connected, there is an attenuator (GAIN)
that allows the adjustment of the correct
sensitivity level of the equipment
connected.

4-OUTPUT CONNECTION

In general, the BALANCED OUT has to be
used to reach the main sound System of the
installation. This output is electronically
Balanced. This means that it will send a
signal totally free of humming sounds and
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interference.
It is especially recommended when the next
device on the chain (such as EQ's or
Amplifiers) are at a certain distance or in an
area (a rack, a piece of furniture, etc...)
electrically "contamined" by other devices
that generate non-filtered electro-magnetic
waves (low-quality lighting equipment,
industrial machinery, and so on).
In order to reach total efficiency with this
output, the device that will later receive the
signal must also be prepared to receive
Balanced or Symmetrical signals. To
prepare an appropriate connection, a good-
quality cable (one shield and two live
wires) and two XLR-3 type female
connectors will be required for connection
to the mixers.
At the end of the cable, a suitable type of
connector will be needed for the signal-
receiving equipment.
BALANCED CONNECTIONS: Whenever
a chain of elements that are able to receive
balanced signals is available, the polarities
of the terminals on the connector must be
respected.
Pin 1 for the shield (ground), Pin 2 for the
positive pole (red) and Pin 3 for the
negative (blue).
If the connector required is a ¼" (6.3mm)
Jack, a 3-contact Stereo model should be
used to maintain the Balanced condition.
The connection polarity should be: Tip +
(red), Middle - (Blue) and Body Ground.
If a Balance connection is not possible, that
is, if the next device on the chain is not
prepared to receive this sort of signal
(unbalanced, asymmetrical) so, therefore,
there is only a two-pole connector (1/4"