JBL 6230 - 2.5 EXTERNAL CONNECTIONS

Dual
Mono:
If
both
channels
of the
amplifier
are
driving
the
same
signal
to
different
loudspeakers
the
dual
mono
mode
saves
a
patch
cord
or
Y-cord.
Input
is
to
Channel
A.
Output
on
Channel
A is
controlled
by
the
Channel
A
Level
control.
Output
on
Channel
B
is
controlled
by the
Channel
B
Level
control.
Input
B is
not
used.
Bridged
Mono:
This
mode
makes
the
stereo
amplifier
into a
single
mono
amplifier
with
the
power
of
both
channels
combined.
Input
is
to
Channel
A.
Level
control
is
by
Channel
A
Level
control
and
output
is
taken
from
the red
binding
posts
of
Channels
A
and
B as
described
in
Section
2.5.5.
2.5
EXTERNAL
CONNECTIONS
2.5.1
INPUT
CONNECTIONS,
GENERAL
Input
signal
wires
should
be
shielded
cable,
and
connected
in
accordance
with
standard
wiring
practice
to
either
the
three-
conductor
6.3
mm
(1/4
in)
phone
jacks,
the
XL-type
connectors
or
the
barrier
strip
on
the
back
of
the
chassis.
See
Figures
2-1,
2-2
and
2—3.
NOTE:
The JBL
Amplifier
input
connectors
are
wired
as
follows:
PHONE
XL-TYPE
BARRIER
STRIP
JACK
CONNECTOR
CONNECTION
Tip
Pin
#3
+
or
HIGH
Ring
Pin #2
-
or
LOW
Sleeve
Pin
#
1
AUDIO
GROUND
For
a
given
channel,
either
the
XL-type
connector,
the
phone
jack
or the
barrier
strip
may be
used.
Since
all three
connect-
ors are
wired
in
parallel,
however,
only
one
should
be
used
at a
given
time
(unless
it
is
specifically
desired
to
loop
a
signal
through
the
amplifier
input).
The
amplifier
will
not
unbalance
floating
or
balanced
input
sources
since
the
input
circuits
consist
of
balanced
diff-
erential
amplifiers.
To
use
an
unbalanced
source,
wire
the
signal
carrying
conductor
of the
cable
from
that
source
to
XL-
type
pin
3
(phone
plug
tip)
,
and
wire
the
shield
to
XL-type
pin
1
(phone plug
sleeve).
The
unused
connector
terminal,
pin
2
(ring)
,
should also
be
connected
to
shield
ground.
Unbalanced
connections
are
simplified
by
using
two-conductor
standard
phone
plugs because
they
automatically
short
the
ring and
sleeve
together
when
inserted
in
the
input
jacks.
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7
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