rd204 & rd204fx
9
1. Introduction
Congratulations for having chosen rd204! To make the
best use of the mixer, please read this manual thoroughly
before operating the equipment.
2. Contents
3. Instructions for use and installation . . . . 9
4. MONO input channel (fig. 1) . . . . . . . . . . 9
5. STEREO input channel (fig. 2) . . . . . . . 10
6. MASTER section (fig. 3) . . . . . . . . . . . . 10
7. Front Panel Connections (fig. 4) . . . . . . 12
9. Rear Panel (fig. 5) . . . . . . . . . . . . . . . 12
3. Instructions for use and installation
1. Protection and maintenance.
To avoid jeopardizing correct operation, it is best not to
position the mixer for long periods in exposed places (damp,
high temperature, etc.), in dusty environments or those
subject to strong vibrations. Do not force knobs, switches or
faders: they have been designed to respond to a light touch
and could be damaged if treated with excessive force. In the
event of breakdown, do not open the mixer, but contact the
nearest GENERALMUSIC Service Centre.
2. Prevention of possible interference.
First of all, check that the mixer is installed in a place free
from industrial or RF (radio frequency) interference. Avoid
installing your equipment very near radio or TV sets, mobile
phones, etc., as these can cause noisy interference.
3. Connection to the mains power supply.
Before connecting the mixer to the mains socket, always
make certain that the electric system and mains socket have
an adequate grounding, compatible with the safety norms.
Be sure also that the mains voltage corresponds to that
shown on the rear of the unit (an allowance of up to ±10%
is accepted) and that the power cord is not damaged and
has no bare wires. It is best to lower (or better still close)
the output levels and switch off any amplifiers connected
to the line output of the mixer before switching the mixer
on or off: this avoids annoying and sometimes dangerous
(particularly for the speaker cabinets) signal peaks.
4. Connector cables.
When connecting the mixer to the amplifiers or the amplified
speakers, make certain to always use only screened signal
cables made up of two wires plus a braid/screen: the use
of unscreened cables could in fact probably cause annoying
hum and noise. Check periodically that your cables are in
good condition, correctly wired and with perfectly efficient
contacts: in fact many problems and drawbacks (false
contacts ,ground hum, crackles, etc.) are caused by the use
of unsuitable or damaged cables.
4. MONO input channel (fig. 1)
1. MIC INPUT
Balanced XLR: this input receives the MICROPHONE signal
on the channel and can accept a wide range of balanced
or unbalanced low impedance signals, including the signal
coming from condenser microphones with +48V power
supply (see Rear panel).
2. LINE INPUT
Balanced JACK: this input can receive high-impedance signals
from equipment with a LINE output.
3. GAIN
Gain control of the amplification of external signals fed into
the channel.
Input sensitivity is 0dB to –60dB (MIC sensitivity) and
+15dB to –45dB (LINE sensitivity).
IMPORTANT: a good quality signal depends first on a
correct input sensitivity. For this reason, use the PFL
SOLO function and adjust the GAIN control so that the
LEDs on the LEVEL METERS stay around "0" and don't
go higher than +4dB. Check also that the PEAK LED
would not light AT ALL.
4. LOW CUT
HI-PASS filter that allows to reduce the frequencies below
75Hz with a 18dB/Oct. slope. Thanks to this filter it’s
possible to eliminate unwanted subsonic frequencies, like,
for examples the microphones rumble due to the stage
resonance.
5. HIGH
HIGH frequency control: gives a 15dB boost or cut at 12kHz
with a “SHELVING” curve.
6. MID
MID frequency control: gives 15dB boost or cut from 100Hz
to 8 kHz with a “PEAKING” curve.
7. LOW
LOW frequency control: gives 15dB boost or cut at 80Hz
with a “SHELVING” curve.
8. AUX 1-2 PRE
The AUX send 1 and 2, provided for the use with stage
monitors, are PRE-FADER: this means that the signal sent to
the MONITORS is derived before the control of the channel
FADER, providing a monitor mix completely independent
from the MAIN MIX.
9. AUX 3 PRE/POST
The AUX send 3 normally is PRE-FADER for the use with
stage monitors, are PRE-FADER. Pressing the POST button
AUX 3 can be also set POST-FADER and, therefore, it can be
used as an additional effect send.