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Peavey CS 400x - Channel A Inputs and Connections; High Z Input Jacks; Low Z Input; PL-2 Selector Switch

Peavey CS 400x
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CHANNEL
A
HIGH
Z
INPUT
JACKS
(5)
Two
parallel
(bridged)
input
jacks
arc
provided.
This
allows
for
one
to
be
used
as
a
conven¬
tional
input,
and
the
other
to
be
used
simultaneously
as
a
“line
out”
(Y-cord)
to
connect
to
another
input
jack
on
this
amplifier
or
other
amps/equipmenl.
These
1/4"
jacks
arc
not
“chassis
grounded"
and
when
used
will
provide
a
QUASI-BALANCED
input
capability
due
to
a
unique
“groundloop"
elimination
circuitry
associated
with
the
input.
This
feature
will
normally
allow
“hum
free"
operation
when
relatively
short
1/4"
cable
patches
are
made
between
the
various
jacks
on
this
amp
and
other
jacks
on
equipment
That
share
the
same
rack
with
this
amp.
This
QUASI-BALANCED
capability
is
automatic,
and
it
can
not
be
removed
from
the
system’s
circuitry.
LOW
Z
INPUT
(6)
A
conventional
three-pin
female
XLR
input
jack
is
provided
and
may
he
used
as
the
channel
A
input.
When
the
(PL-2)
line
balancing
transformer
is
not
used,
this
XLR
input
becomes
QUASI-BALANCED
with
pin
#3
as
the
positive
input
(connecting
to
the
tip
of
the
1/4"
input
jacks
above),
pin
#2
as
the
negative
input
(connecting
to
the
floating
sleeve
of
the
1/4"
input
jacks
above),
and
pin
#1
going
to
chassis
ground.
When
the
(PL-2)
line-balancing
transformer
is
used,
this
XLR
input
becomes
fully
TRANSFORMER-BALANCED
(Pin
#3
positive,
pin
#2
negative,
pin
#1
ground).
(See
tire
PL-2
SELECTOR
SWITCH
section
for
details
on
related
settings)
PL-2
SELECTOR
SWITCH
(7)
This
switch
is
to
be
used
in
conjunction
with
the
PL-2
transformer
to
allow
the
LOW
Z
INPUT
to
function
with
or
without
a
PL-2
module
being
insetted
in
the
receptacle.
A
similar
function
was
performed
by
using
a
PL-1
module
inserted
in
the
PL-2
receptacle
on
older
amplifier
models.
The
“OUT’
position
of
this
switch
selects
the
QUASI-BALANCED
mode
of
opera¬
tion
for
the
LOW
Z
INPUT
(XLR
jack),
and
routes
the
input
signal
directly
to
the
HI
Z
INPUT
JACKS.
In
this
position
the
HI
Z
INPUT
JACKS
may
be
used
as
outputs
after
the
LOW
Z
INPUT
to
allow
patching
this
signal
to
another
input
on
this
amp.
Normally,
in
this
switch
position,
a
(PL-2)
transformer
is
not
present
(“OUT’)
in
the
transformer
receptacle;
however,
if
one
were
“IN"
the
receptacle,
the
LOW
Z
INPUT
would
still
be
QUASI-BALANCED.
It
becomes
TRANSFORMER
BALANCED
only
when
the
IN
switch
position
is
selected.
Notice
this
is
a
very
effective
means
to
“test"
for
the
necessity
of
a
line-balancing
transformer.
The
“IN”
position
of
the
switch
routes
the
input
signals
from
the
XLR
jack,
through
the
(PL-2)
line-
balancing
transformer,
thus
selecting
the
TRANSFORMER
BALANCED
mode
of
operation
for
the
LOW
Z
INPUT.
In
this
position
the
HI
Z
INPUT
JACKS
may
be
used
as
outputs
after
the
line
balancing
transformer
to
patch
the
signal
to
another
input
jack
on
this
amplifier
or
other
amps/equipment.
If
the
“IN”
position
is
selected
without
a
(PL-2)
line-balancing
transformer
“IN”
the
receptacle,
the
LOW
Z
INPUT
will
be
rendered
inoperable.
TRANSFORMER
RECEPTACLE
(8)
This
receptacle
only
receives
the
optional
(PL-2)
line-balancing
transformer.
When
conditions
exist
that
demand
the
usage
of
a
TRANSFORMER-BALANCED
XI
JR
CONNECTOR
at
the

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