2.3 Proper Cooling Considerations
Because the AV 50 regulates its temperature using convection cooling
and no fans, the amplifier must be given adequate space to allow for
proper airflow. Do not stack the amplifiers on top of each other or
mount it in a way that other equipment will block airflow through the
case.
CAUTION: Inadequate airflow to the amplifier can cause the
amplifier to overheat and potentially become damaged in
the process. Be sure to provide plenty of air space to allow
for convection cooling.
2.4 Input Connections
The AV 50 allows for two different type of unbalanced input connec-
tions (RCA and 3.5mm TRS) to be used for the input signal. However,
only one input type may be used at a time.
RCA, or phono connections allow for mono inputs to be connected to
each of the two channels. These inputs are unbalanced and should be
wired as shown in the following diagram.
A single 3.5mm TRS (stereo) connector will allow for two unbalanced
signals to be sent to the amplifier using only one cable. The tip of the
connector (the left channel) will be sent to Channel 1. The ring of the
connector (the right channel) will be sent to Channel 2. Please refer to
the following diagram for wiring instructions.
2.5 Output Connections
Stewart Audio recommends using high-quality, heavy-gauge speaker
wire and connectors to send the output signal of your amplifier to the
speakers. Use the following table as a guideline when selecting your
wire gauge.
Speaker leads connect by means of “Phoenix” type block connectors
supplied with the unit. Strip speaker leads 1/4” and insert into connec-
tor observing proper polarity. With a small, flat-blade screwdriver,
tighten the screw until the leads are held securely in place. Inspect for
possible shorts or broken wires.
2.6 Wiring Configurations
2.6.1 Dual Mode
Your Stewart AV-Series amplifier is factory-configured to work as a dual
-mode (stereo) amplifier. This allows the amplifier to power two speak-
ers with independent source inputs and gains.
Input Connections
If using RCA (phono) input connectors, connect them to the Channel 1 and
Channel 2 inputs on the rear of the amplifier. If using the 3.5mm TRS connec-
tor, connect it to the appropriate socket.
Do not connect a signal to both inputs as this could cause damage to
your amplifier.
Output Connections
Prepare the speaker leads as described in
section 2.5
. The speaker
leads should be attached to the Phoenix block connector with regard to
their polarity. See diagram for further clarification.
Distance Wire
Gauge
Up to 25 ft.
16 AWG
26-40 ft.
14 AWG
41-60 ft.
12 AWG
Over 60 ft.
10 AWG
+
Ground
(Shield)
+
Ground
(Shield)
+/Ch 1
-/Ch 2
Ground
(Shield)
+/Ch 1
-/Ch 2
Ground
(Shield)
7
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