Jbl 56002 b schematic

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The JBL 5600-2B is a solid-state mixer/preamplifier capable
of combining four microphone and two program channels. It
can be expanded to six microphone and two program inputs.
and any microphone channel may be converted to a program
channel by installing optional plug-in accessories. The unit
leatures controls designed tor ease oi operation, wide
dynamic range, extended frequency response, very low nOIse
and low distortion.

Each microphone channel is an unbalanced high impedance ,

input, and can be convened to accept a low impedance
microphone by insertion of a 5901 accessory transformer in a

, '___,PfofeSSiorial Series
1 Model 5600-23
7 MiXeifIPreamplifier

socket provided for that purpose. Two microphone channels
can be added by installing the 51908 microphone preamp
expander module on the main chassis oi the mixer, The two
added microphone channels have the same performance
characteristics and will accept the same accessories as the
original microphone inputs. lnstallation of the expander is
simple, since the audio output and power connections are
routed through a single five-pin plug. and labeled cutouts for
the added microphone level controls are concealed behind
a removable plate at the upper left-hand corner of the front

panel. Input to each microphone channel is through a three-
pln female XLR receptacle.

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Model 5600-23 Mixer/Preamplifier

The two program channels are each wired for 50,000-ohm
unbalanced operation. and equipped with both screw
terminals and an alternate phono jack for input connection.
Each program channel may be convened to a 15.000-ohm
balanced bridging input by insertion of a 5195 accessory
matching/bridging transformer. A minor wiring modification
will further convert the socket so that the 5195 provides a
BOO-ohm balanced matching input,

Any of the microphone channels may be convened to an
unbalanced 50.000-ohm program input. with the same
sensitivity as the standard program channels. by insertion of
an accessory T»pad. model 5904. Added program flexibility
is provided by the 5191, an accessory plug-in magnetic
phono/tapehead preamplifier.

Individual level controls permit precise balancing of the
various inputs. and a Master Gain control determines the
overall program and monitor volume levels. The mixer output
is designed to drive a BOO-ohm line and is available at a
phono jack on the rear panel of the unit. The output can be
convened to a 600~ohm balanced line by insertion of a 5195
transformer in the socket provided, With the 5195 installed.
the balanced output will be available on screw terminals and
the original unbalanced output can be used to drive loads
greater than 10,000 ohms.

A Cue/Normal control permits the program output to be turned
on and off without disruption of the monitor. This feature allows
auditioning a mix prior to program feed. The monitor output,
available at a phone jack on the front panel. can be used for

Installation of the 51903. Front panel cutouts are labeled
"MIC 5" and "MIC 6.

headphones or to drive an auxiliary amplifier. The tone
controls offer out at 150 Hz and boost or cut at 7 kHz;
midrange material is not affected. The controls affect both
the main program and monitor outputs The entire mixer.
including accessories. mounts in three EIA standard

rack spaces.

Architectural Specifications

The mixer shall have an output of +18 dBm with less than
0.25% THD and shall have a frequency response of 20 to
20.000 Hz. 1'10 dB at +18 dBm. It shall have four microphone
and two program inputs as standard equipment The mixer
shall also accept an expander module which provides two
additional microphone channels and mounts on the mixer
chassis. All microphone inputs. including the expander inputs.
shall be identical.

The microphone circuits shall be equipped with sockets for
mounting optional plug»in transformers to permit the use of
low impedance microphones, or for plug-in T-pads to
accommodate high level sources. Three~pin female

XLH receptacles shall be provided for the microphone
channels. The high impedance program inputs shall be
provided with sockets to accommodate accessories so that
they will accept a tuner. magnetic phono or tapehead and
shall be capable of matching a telephone line. Each program
channel shall be equipped with a phono jack and screw
terminals, so that each can be used for one of the inputs from
a stereo source.

WM.»

The mixer shall have an unbalanced GOO-ohm output (+18
dBm maximum) available at a phono jack. and a socket shall
be provided to accommodate a plug-in accessory transformer
for a balanced output. Three screw terminals shall be
provided to accommodate the balanced output and ground
connections when the transformer is installed. With the output
transformer installed. it shall be possible to use the
unbalanced output to drive loads greater than 10.000 ohms.

A jack shall be provided on the front panel to allow headset
monitoring or connection to the 600-ohm input of an auxiliary
amplifier The monitor output shall not be affected by the
Cue/Normal switch which turns the program output on and off.

The performance shall be as listed under SPECIFICATIONS
and shall be met or exceeded.

The mixer shall be JBL Model 560028.