Krell Industries Evolution One Owner's Reference Manual page 27

3.
Press the power button (3), located underneath the far left edge of the amplifier
chassis front panel. The power/stand-by LEDs (4) on the amplifier and power
supply chassis illuminate in blue. The backlight (5) and the meter scale (6) on the
amplifier chassis illuminate in blue.
You may now switch between CAST and balanced operation. For more infor-
mation, see Switching between Cast and Balanced Inputs, below.
4.
With the preamplifier muted, or the volume control completely lowered, select
a source. Increase the volume control to the desired listening level.
5.
To place the amplifier in stand-by mode, press the power button (3) on the
front panel. It is now safe to turn off the rest of the system.
Switching Between CAST and Balanced Inputs
If a CAST and balanced source are connected during the initial installation, see
Cable Connection Steps, pages 19-20, the Evolution One defaults to CAST and
the CAST LED illuminates in blue when the amplifier is powered on.
If only one source is connected, the amplifier automatically selects that source. If
the amplifier detects a balanced source, there is no illuminated LED.
To switch between CAST and balanced inputs, press the CAST/Balanced button
(11), located underneath the far right edge of the amplifier chassis front panel.
CAST cables must be engaged for this function to be operational.
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continued