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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.
-
7
-
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