Iii. Inputs; Mx 1000A; Mx 1500A; Mx 2000A - QSC MX 1000a Owner's Manual

III. INPUTS

An MXa amplifier features balanced inputs, connected
via barrier strip terminals or 1/4" (6.3 mm) tip/ring/sleeve
phone jacks. The tip of the input jack is wired for "nega-
tive' or inverted polarity, while the ring is the non-inverting
input. Thus, if the voltage at the tip is positive with respect
to that at the ring, the amplifier channel will produce a
negative voltage at its output.
For use with unbalanced signals, connect the unused
terminal to ground to avoid a reduction in gain caused by
a floating input; use a two-conductor (tip/sleeve) plug, or
connect a jumper between the inverting input terminals
on the barrier strip and their adjacent ground terminal.
MX 1000a INPUTS
The amplifier's input sensitivity is 1.1 volt rms; at this
signal level and input attenuators set for full gain, the
amplifier will produce full rated power—250 watts, 20Hz-
20kHz, 0.1% THD—into an 8-ohm load. The input imped-
ance is 20 kilohm balanced and 10 kilohm unbalanced,
typical of QSC amplifiers.
WARNING:
OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOSTURE.
TIP NEG RING POS
CH 2
SLEEVE GND
CH 2 +
Figure 3: QSC MX 1500a Back Panel (identical to the MX 1000a)
WARNING:
OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOSTURE.
TIP NEG RING POS
CH 2
SLEEVE GND
CH 2
+
–
A U D I O
Figure 4: QSC MX 2000a Back Panel (identical to the MX 3000a)
TO REDUCE THE RISK OF FIRE
TIP NEG RING POS
INPUT CH 1
SLEEVE GND
STEREO
+ CH 1 PARALLEL BRIDGE
– –
GND
TO REDUCE THE RISK OF FIRE
TIP NEG RING POS
INPUT CH 1
SLEEVE GND
STEREO
CH 1
+ PARALLEL BRIDGE
GND –
MX 1500a INPUTS
The amplifier's input sensitivity is 1.07 volt rms; at this
signal level and any attenuators set for full gain, the
amplifier will produce full rated power—350 watts, 20Hz-
20kHz, 0.1% THD—into an 8-ohm load. The input imped-
ance is 20 kilohm balanced and 10 kilohm unbalanced,
typical of QSC amplifiers.
MX 2000a INPUTS
The amplifier's input sensitivity is 1.05 volt rms; at this
signal level and any attenuators set for full gain, the
amplifier will produce full rated power—450 watts, 20Hz-
20kHz, 0.1% THD—into an 8-ohm load. The input imped-
ance is 20 kilohm balanced and 10 kilohm unbalanced,
typical of QSC amplifiers.
MX 3000a INPUTS
The amplifier's input sensitivity is 1 volt rms; at this signal
level and any attenuators set for full gain, the amplifier will
produce full rated power—800 watts, 20Hz-20kHz, 0.1%
THD—into an 8-ohm load. The input impedance is 20
kilohm balanced and 10 kilohm unbalanced, typical of
QSC amplifiers.
An MXa Series amplifier features a Level I Open Input
Architecture slot. See Section 2 for more information
about Open Input Architecture.
– –
BRIDGED MONO
+ +
CHANNEL 2 CHANNEL 1
– –
STEREO 4 OHM MIN/CH. CLASS 2 WIRING
BRIDGED MONO 8 OHM MIN.
CLASS 1 WIRING MUST BE USED
BRIDGED MONO OPERATION: PLACE BRIDGING SWITCH ON INPUT PANEL
TO BRIDGED POSITION. CONNECT INPUT SIGNAL TO CH 1 ONLY.
CONNECT SPKR (+) TO CH 1 (+) OUTPUT. CONNECT SPEAKER (–) TO
CH 2 (+) OUTPUT. SET CH 2 GAIN FULLY CLOCKWISE AND REGULATE
LEVEL WITH CH 1 GAIN CONTROL.
CHANNEL 2
STEREO 4 OHM MIN/CH.
BRIDGED MONO 8 OHM MIN.
BRIDGED MONO OPERATION: PLACE BRIDGING SWITCH ON INPUT PANEL
TO BRIDGED POSITION. CONNECT INPUT SIGNAL TO CH 1 ONLY.
CONNECT SPKR (+) TO CH 1 (+) OUTPUT. CONNECT SPEAKER (–) TO
CH 2 (+) OUTPUT. SET CH 2 GAIN FULLY CLOCKWISE AND REGULATE
LEVEL WITH CH 1 GAIN CONTROL.
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
A U D I O
AVIS
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
– –
BRIDGED MONO
+ +
CHANNEL 1
– –
CLASS 2 WIRING
CLASS 1 WIRING MUST BE USED
AVIS
5