QSC Audio RMX 4050HD Manuel De L'utilisateur page 5

SELECTING STEREO, PARALLEL, OR
BRIDGE MODE
The amplifier can be set for normal Stereo operation, Par-
allel input Mode, or Bridge Mono Mode.
Stereo Mode- Each channel remains independent. The
amplifier may be used for two different signals.
Parallel Mode - This setting connects both inputs
together. One signal feeds both channels. Each channel's
Gain control and loudspeaker connection remain indepen-
dent.
Bridge Mode- This setting combines both channels into
a single channel with twice the output power. Use only
the first channel's input and Gain control. Set the second
channel's Gain control at minimum. The load must be
rated for the higher output power, and is connected as
shown in the Outputs section.
Do not connect different inputs to each side of a
channel pair when operating in Parallel or
Bridge Mode.
SETTING LOW FREQUENCY FILTERS
Each channel has a 12dB per octave Low Frequency Filter
to prevent cone overexcursion, making more power avail-
able for the loudspeaker's rated frequency range. This
reduces distortion and prevents amplifier overload.
The Filter should only be turned off for driving subwoof-
ers with special low frequency capability. Otherwise,
unless you have filtering in the signal path preceding the
amplifier, use the Low Frequency Filter. The loudspeaker's
documentation will specify the low frequency limit.
BARRIER STRIP INPUTS
Each channel has a balanced 3-terminal input. Wiring is
connected with simple hand tools, and inputs can be
changed quickly.
The input impedance is 20k ohm balanced or 10k ohm
unbalanced.
Balanced connections are recommended to reduce AC
hum and interference, especially with long cable runs.
Unbalanced connections may be suitable for short cables.
The signal's source impedance should be less than 600
ohms.
If unbalanced connections are required, connect a jumper
wire between the minus (-) terminal and the ground ter-
minal. Then connect the input signal to the positive (+)
terminal and the shield to the minus or ground terminal.
Stereo Mode - Switches
4, 5, 6 and 7 are all set to
the LEFT position.
Parallel Mode -
Switches 4, and 5, are
set to the RIGHT posi-
tion. Switch 6 and 7 are
set to the LEFT position.
Bridge Mode- Switches
4, 5, 6,7 and 8 are all set
to the RIGHT position
and Switch 10 is set to
the LEFT position.
Each channel has its own
switches for LF Filter on/off and
frequency selection.
Channel 1 uses switches 2,3.
Channel 2 uses switches 8,9.
Switches 3 and 8 turn the LF Fil-
ter ON. Switches 2 and 9 select
30Hz or 50 Hz.
Balanced inputs: Strip the
wires ¼ inch (6 mm) and
connect to the terminals as
shown. Be sure to tighten
the screws firmly.
Unbalanced inputs: Strip
the wire ¼ inch and con-
nect a jumper wire
between the minus (-) ter-
minal and the ground ter-
minal. Then connect the
input signal to the positive
(+) terminal and the shield
to the minus or ground ter-
minal, as shown. Be sure
to tighten the screws
firmly.
EN
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