Qsc pl218a 사용자 설명서

The amp's protective muting system guards against excessive internal temperatures. With normal ventilation and 4 to 8 ohm loads, the amplifier will handle any signal level including
overdrive. Lower load impedances and higher signal levels produce more internal heating. When using 2 ohm loads, frequent or prolonged clipping  may trigger power cutback or
protective muting.

BRIDGE mode doubles the output impedance of the amp; 4 ohms  is the minimum load impedance. Heavy clipping may cause muting. If this happens, see Troubleshooting section.

Before applying power, check all connections and turn down the gain controls. The "soft start" sequence starts with the 

POWER indicator

LED at half brightness. A few seconds later the fan starts, the 

POWER indicator fully illuminates and the amplifier mutes for two seconds.

The 

CLIP LEDs will glow bright red. When the CLIP LEDs go out, the amplifier is ready.

At full brightness, the green POWER

 LED indicates that the amplifier is operating. Half brightness indicates the

amp is in its start-up sequence or 

STANDBY mode.

As the input signal strength increases, the green SIGNAL, -20dB,

 and amber -10dB LED indicators light

respectively at 0.1%, 1% and 10% of full power.

The red CLIP

 LED indicator flashes during overload (clipping). A bright, steady glow indicates protective muting;

if this occurs during use, see Troubleshooting.

The yellow BRIDGE

 LED illuminates when the MODE switch is set to BRIDGE.

The blue BI-AMP LED illuminates when the MODE switch is set to BI-AMP.

The orange PARALLEL

 LED illuminates when the INPUT CONFIGURATION switch is set to PARALLEL.

Turn down the gain controls before applying power. The gain controls are detented 21 steps for repeatable adjustment. Surrounding the gain control knob,  the attenuation level is shown
in dB. The gain structure may be selected on the PL2A. On the rear panel you will find a switch labeled 

GAIN-SENSITIVITY SELECT; you may select from +4 dB input sensitivity, 32 dB

or 26 dB of voltage gain.