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Initial Setup
Please refer to the front and rear panel diagrams, as needed. [Page 8]
Line Level Inputs
Warning:
Always disconnect power
to the amplifier when
changing cables.
Two inputs per channel are provided.
The RCA jack is a standard input that
accepts single-ended sources. The
female XLR jack allows true balanced
hookup operation using the standard
pin configuration:
Pin 1 Ground
Pin 2 Input +
Pin 3 Input -
System ground optimization is criti-
cal to achieving low noise perform-
ance. This is especially critical when
using the RCA inputs.
The XLR/RCA switch is used to opti-
mize the grounding at the amplifier
inputs. Setting the XLR/RCA switch in
the RCA position connects the RCA
ground to the chassis and the power
cable.
If using Balanced XLR cables then
leave the switch in the XLR position,
otherwise the negative XLR input will
be shorted to the amplifier ground.
If using the RCA inputs and the
Preamplifier has a floating ground
then using the RCA switch position
will give the lowest noise operation.
This will connect the system ground
to the power ground at the amplifier.
Try connecting the RCA ground to
chassis ground by depressing the
RCA/XLR switch button (RCA posi-
tion). If this button is depressed and
there is ground noise or hum then try
setting this switch in the XLR posi-
tion.
Putting this switch in the XLR posi-
tion effectively lifts the RCA ground
on the amplifier input and can pre-
vent ground loop noise. This is espe-
cially useful for systems using more
than one amplifier chassis or when
using the eVo4 or eVo6 amplifiers in
a system.
These procedures should be ade-
quate to correctly ground most
systems.
page 6© 2002-2004 bel canto design, Ltd. eVo User’s Guide 042104
Optimizing Input Grounds