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2. Introduction
Thank you for purchasing the Russound AB-4 Amplified Automatic A/B Selector. By following instructions this
product will perform as it was designed. It is our mission to provide the highest quality product; for years of
enjoyment.
The AB-4 is most commonly used in applications where a local source, such as a TV, needs amplification to
share the local audio distribution speakers. Although many televisions do not have amplified speaker outputs,
many do have variable line audio outputs that connect to an amplifier. The AB-4 is ideally used for this applica-
tion. The AB-4 will sense the signal from the television's line audio or video outputs. When the signal is detected,
the AB-4 will automatically switch out the whole-house audio and switch in the 56 watts per channel amplified
output. This is done without interruption to the rest of the audio distribution system. The AB-4 is placed near the
source being amplified and connected using standard line audio cables. The main audio distribution system and
speakers are connected to the AB-4 using standard speaker wire. In the default mode of operation, the whole-
house audio will play through to the speakers. The AB-4 has a SENS adjust which sets the trigger sensitivity for
the incoming line audio signal, and a delay adjustment to prevent the AB-4 from switching back to the default
input during low volume passages. The volume and balance are controlled by the independent left and right vol-
ume adjustments.
3. Features
The AB-4 shares the speakers with a local source and the whole-house audio system. The switching from the
whole-house audio to the local source is automatically actuated by the audio or video sensing inputs. When the
signal is sensed, the AB-4 engages the amplified outputs and the 12 volt triggered output. The 12 volt trigger can
be used to activate a screen, close curtains or to simply trigger another device. The video input includes a loop-
through connection, providing a continuous video path to other components. The amplified power output per
channel is a constant 56 watts into an 8 ohm load and 62 watts into a 4 ohm load. The left and right audio
amplifiers are attached to a large heat sink to allow the amplifiers to run at a high volume output for extended
periods of time. The audio amplifier section includes independent thermal and short-circuit protection, allowing
for years of reliable operation. The AB-4 is proudly manufactured in the USA at our facility in Newmarket, NH.
4. Explaining The Indicators
4.1 Source Indicator
Indicates the source that is switched to the speakers. Source A for the whole-house audio and source B for the
local source.
4.2 Power
The indicator for power will be illuminated when the AC cord is plugged in. To shut off the unit, unplug the
power cord.
S
OURCE
A
B
A
A
A / B
S
M P L I F I E D
U T O M A T I C
E L E C T O R
POWER ON INDICATOR
P
OWER
SOURCE INDICATOR
AB-4
3
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