ETI Sound Systems, INC US-3000 - Manual (Page 8)

THE BEAUTY OF POWER
B-52 US Series Professional Power Amplifiers - Instruction Manual
US SERIES AMPLIFIERS
FRONT PANEL CONTROLS
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Opposite page
1. RACk MOUNTINg POINTS
Points to bolt your amplifier into a rack.
2. AIR VeNTS
US-Series amplifiers are cooled by two rear-mounted
fans (US-1200 has one fan) and open cell foam filters
mounted behind the front vents.
CAUTION: Never block the front or rear vents
and keep them clean at all times.
NOTe: Periodically clean the foam filters using a
vacuum cleaner to avoid dust from blocking the
vents. If the filters become too dusty, it may
decrease your amplifier’s ability to dissipate
and remove heat efficiently. If the filters become
too dusty and too difficult to clean externally, you
can access the filters and remove them for
cleaning. Refer to the cleaning procedure later
in this manual.
3. BlUe IllUMINATed STRIPS
These two blue illuminated strips glow when your
amplifier is turned ON.
4. ChANNel 1 ANd ChANNel 2
leVel CONTROlS
Use these 21-position detented controls to adjust the
output levels of Channel 1 and Channel 2. When
the LEVEL controls are set fully counter-clockwise, the
signal is attenuated by more than 80dB (marked -∞).
When the LEVEL controls are set fully clockwise, the
signal is amplified with maximum gain. When the
LEVEL is set fully clockwise, the amplifier produces
its rated output power at a 4 Ohm load with +4dBu
(1.23Vrms) signal applied to the inputs. All detents
are marked in dBs showing the attenuation of
the output signal with reference to the fully
clockwise position.
NOTe: In PARALLEL MONO mode, both of the
Channel 1 and Channel 2 LEVEL controls are
used to adjust the signal level for their respective
channels. The signal should be routed only to
the Channel 1 input in this mode.
NOTe: In BRIDGED MONO mode, only the
Channel 1 LEVEL control is used to adjust the
signal level. The signal should be routed only to
Channel 1’s input in this mode.
5. SIgNAl Indicators
These green LEDs will illuminate indicating that a
signal is being received through the input and that
the signal is being amplified. There are three LEDs on
each channel: SIGNAL, -20dB and -10dB.
6. ClIP Indicators
These red LEDs will illuminate at the clipping
threshold. If the CLIP LEDs light frequently, you are
overloading the amplifier, causing gross distortions
on the outputs. Heavy clipping is bad for both your
speakers and amplifiers and should be avoided.
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