Front Panel Controls - Quest Engineering PB-4120 Owner's Manual

Front Panel Controls

Front Panel Controls
1 2
1. Handle - For easy transport while carrying,
or while rack mounting, the amplifier features
two heavy duty die cast handles located
conveniently on the left and right side of the
front panel.
2. Fan Vent - The amplifiers stay cool thanks
to their twin, forced-air cooling vents. Cool
air is drawn through the front panel fan filters,
reducing the temperature of the internal
components while forcing the heat out the
rear vents.
3. Clip LED - The CLIP segment lights
whenever the channel is outputting signal
at full strength. For the best signal-to-noise
ratio, the right (PEAK) segment should light
occasionally during peak levels; if it lights
frequently, you may be overloading the
PB-4120
and a distorted ("clipped") signal is
probably being output.
4. Protection LED - This goes on for
approximately one second, whenever the
PB-4120
is powered on and then turns off
. The Protection LED will also light when
overheating or other severe problems occur.
It is normal for the Protection LED to fade
slowly when the amp is powered off. When
lit, no signal is provided to any connected
speakers, thus muting them and preventing
any "thump" from occurring.
5. Signal LED - The front panel LED
indicators continuously monitor the power
4
3 4
CH 1 CH 2
PROTECT
CLIP
-20 dB
SIGNAL
output level for the corresponding channel.
The SIGNAL LED lights whenever output
signal is present.
6. Power switch - Use this to power the
Amplifier on or off. The internal LED lights
whenever the Amplifier is powered on.
5 6
PB-4120
POWER AMPLIFIER
CH 3 CH 4
POWER
ON
OFF
PB-4120