3 Operation
3.1 Operating Precautions
1. Before use, your amplifier must be configure for proper operation,
including input and output wiring hookup. Improper wiring can re-
sult in damage to equipment or potentially harm to the operator.
Consult section 2 for setup instructions.
2. Tampering with the circuitry, or making unauthorized changes is
not only dangerous but may also violate local regulations.
3. Use care when making connections between the amplifier and the
input or output equipment. Using equipment that is not capable of
handling the output wattage may lead to permanent damage.
NOTE: Stewart Audio will not be held responsible for dam-
age to your AV 50 or connected equipment if the instruc-
tions in this manual are not followed.
Controls, Indicators, and Connectors
3.2.1 Indicators
The AV50 has 3 front panel LED indicators. The first is the power indi-
cator which will illuminate when power is supplied to the amplifier. The
next 2 LED indicators are the “Clip” indicators, one for each channel.
These lights will indicate that the input signal is too “hot” and will
sound distorted when amplified. To fix this, the gain should be reduced
at the preamp or mixer level.
3.2.2 Controls
The AV 50’s front panel has only one control, a push button to control
the power of the unit. When the push button is depressed, the power
is on. When the button is push button is out, the power is off.
The rear panel contains two input sensitivity knobs as well as a mode
switch. The amplifier is set to run off of a line-level source and the sen-
sitivity should be adjusted for optimum performance. To adjust this
knob, you will need a small flat-head screwdriver. While a typical pro-
gram source level is present, spin the rotary knob as far clockwise as
you can without hearing distortion or without the “Clip” indicator illumi-
nating. If the signal is distorting and the knob is all the way counter-
clockwise, adjust the gain down at the source level.
The mode switch on the rear of the amplifier should only be adjusted
during the primary installation. It switches the amplifier between the
three output modes: Stereo, Mono, and Bridge-Mono. Refer to section
2.6 of this manual for more information.
120VAC 60Hz
120VAC 60Hz
LEVEL
LEVEL
1
2
BRIDGE MONO STEREO
#2 - SPKR - #1
#2 - SPKR - #1
INPUT
STEREO
IN
1
2
Clip
Clip
Power
Power
AV Series
AV Series
AV-50-2
AV-50-2
Front View
Rear View
1
2
3
4
6
5
7
8
9
1
2
3
4
5
6
7
8
9
Clip indicator light
Power on/off switch
Power indicator light
Power cable socket (IEC C13)
Channel volume knobs
Speaker mode switch
RCA (phono) channel inputs
Stereo 3.5mm input
Speaker outputs (Phoenix-tYpe connector)
13
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