Owner's Manual

7
Audio Connections
Always disconnect the AC cord to your A 52+ before making or changing any input,
output or trigger wire connections. Inserting or removing an input or output cable while the
A 52+ is turned on can result in a blast of sound that can damage your loudspeakers. Make
sure there is no strain or tension on any cables that could cause them to pull loose.
Audio Input Connections
Balanced XLR Input Jacks
Balanced connections will give you the best sound. If your surround sound preamplifier has
balanced XLR output jacks, we recommend that you connect them to these inputs. Refer to
the Balanced and Unbalanced Lines in the Technically Speaking section for additional
information about why we recommend using balanced lines.
Note: Using balanced XLR input connectors results in a 6dB
higher volume level compared with using the RCA input jacks.
This is a noticeable increase.
Unbalanced RCA Input Jacks
Use these inputs if your surround sound preamplifier doesn’t have balanced output
connections or if you simply prefer to use unbalanced connections.
Balanced/Unbalanced Selector Switch
Place the switch in the position for the input type you will be using.
Note: The Balanced/Unbalanced switch is not an input selector. Its
function is to optimize the signal to noise ratio for each type of input.
You should not connect both the Balanced and Unbalanced jacks at
the same time with the expectation of switching between two different
devices such as a preamp and surround processor.
Balanced XLR Pin Configuration
The balanced inputs of the A 52+ use XLR jacks that conform to the
industry standard of:
Pin 1: Ground Pin 2: Positive (+) Pin 3: Negative (–).