QSC CMX 2000Va, Руководство пользователя

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16
EN
Operation
AC Power Switch (AC Mains)
Make sure you connect the amplifi er to the correct AC line voltage, as shown on the serial number label.
Connecting to the wrong line voltage is dangerous and may damage the amplifi er
(— Figure 33) .
Before applying power, check all connections and turn the attenuation controls fully counter clockwise to
maximum attenuation.
One second of muting is normal when the amp is turned on or off (— Figure 34) .
Attenuation Controls
The controls are marked with a scale indicating attenuation. Maximum attenuation is fully counter clockwise,
minimum attenuation is fully clockwise. he Attenuation controls are marked in numeric increments from
∞
to 0 (clockwise) indicating the amount of attenuation. Settings should normally be made within the lower
attenuation range. The range above 14 on the attenuation scale should not be used for normal program
levels, as the input headroom could be exceeded, but can be used for testing at reduced gain levels. At the
maximum attenuation setting (
∞
), the signal is completely cut off (— Figure 35) .
LED Indicators
The green SIGNAL LED indicators light at approximately 0.1% of full power.
The red CLIP LED indicator fl ashes during overload (clipping). If the amplifi er's
protection circuitry triggers protective muting, the signal and clip LEDs will not light.
If this occurs during use, see the Troubleshooting section on
page 17 .
Fan Cooling
The fan speed varies automatically
to maintain safe internal
temperatures. Keep the front and
rear vents clear to allow full air fl ow.
Hot air exhausts out the front of the
amp so it does not heat the interior
of the rack. Make sure that plenty
of cool air can enter the rack,
especially if there are other units
which exhaust hot air into it.
Safe Operating Levels
The amp's protective muting
system guards against excessive
internal temperatures. With normal
ventilation and 4 - to 8

loads, the
amplifi er will handle any signal level
including overdrive-but make sure that the speakers can handle the full power! However, lower load impedances and higher signal levels produce
more internal heating. Into 2

loads, frequent or prolonged clipping (indicated by constant fl ashing of the red CLIP LED) may trigger protective
muting. Bridged mono mode doubles the output impedance of the amp; 4

is the minimum load impedance. Heavy clipping may cause muting. If
this happens, see the Troubleshooting section on page 17 .
— Figure 33 —
120 VAC 220-240 VAC
— Figure 34 —
— Figure 35 —
Model Maximum Voltage Gain
CMX 300Va 31.6 x (30 dB)
CMX 500Va 40 x (32 dB)
CMX 800Va 46 x (33 dB)
CMX 2000Va 31.6 x (30 dB)
— Table 4 —
— Figure 36 —
Cool air enters the
ampli
fi er and rack.
Warm air exits the
ampli fi er and rack.
Rack