Gallien-Krueger Fusion 550 Owner's Manual - Page 7

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Gallien-Krueger Fusion 550 Owner's Manual
Fusion 550
800 Hz
BRIGHT
500 Hz
CONTOUR
ACTIVE
INPUT
PASSIVE
GAIN
LOW MID
HI-MID
TO MOTORIZED POTS
DEEP
1.CHANNEL SW
MICRO CONTROLLER
2.MUTE SW
FOOT SWITCH
CHANNEL SW
FUSION 550 BLOCK DIAGRAM

Rear Panel Features

Standard IEC Receptacle. The
1) AC Receptacle:
power cord plugs in here.
2) 500W Amp Only:
¼" speaker output jacks. Im-
pedances Lower than 4 Ohms should not be used.
Higher impedances such as 8 Ohms, 16 Ohms, or
No Load are acceptable. One 4 Ohm, or 8 Ohm, or
two 8 Ohm cabinets are okay. One 4 Ohm and one 8
Ohm together is not recommended. No damage will
result from operating the amplifi er with the speakers
disconnected.
3) Footswitch: ¼" jack for standard 2-pole latching
footswitch. Switches between Channels and activates
the Mute.
4) Tuner Out: Comes directly off of the input stage.
Unaffected by the Mute button or any of the preamp
functions.
5) Effects Return: Returns the Effects Loop signal
to the signal path in series with the preamp signal.
The preamp signal will be interrupted when the Return
jack is used.
6) Effects Send: Provides access to the preamp signal
for putting effects into the signal path. May also be used
to drive other amplifi ers. The signal to the power amp
is not interrupted when the send jack is used.
Fusion 550 Bass Amplifi er
TESTED TO: O:
TESTED TO: O:
TESTED
TESTED
E60065
E60065
CANAD
CANADA
UL6500
UL6500
USA
USA
R
IEC60065
IEC60065
EUR
EUROPE
OPE
C
US
US
FOR 120V 60Hz ONL
FOR 120V 60Hz ONLY
PRE
POST
DIRECT OUT
LEVEL
2
BALANCE
3
DIRECT OUT
1
TUNER
BASS
BALANCE
TRANSFORMER
GROUND
MUTE
SEND
LIFT
TREBLE
QUARTER INCH JACK
RETURN
OUTPUT
500W / 4 OHMS
POWER AMP
FULL POWER: 994W
FULL POWER: 994W
MASTER
1+
1+
50W / 8 OHMS
1- 1-
2- 2-
POWER AMP
2+
2+
ACTIVE HI
HORN
PASS FILTER
1+
1+
SPEAKON
OUTPUT
1- 1-
2- 2-
2+
2+
AC INPUT
AC INPUT
~120V/60Hz
~120V/60Hz
1
P AT C H B AY
P AT C H B AY
FOOTSWITCH
FOOTSWITCH
TUNER
TUNER
RETURN
RETURN
F X
F X
SEND
SEND
5 0 0 W A M P
5 0 0 W A M P
O N LY
O N LY
CLASS 2 WIRING
CLASS 2 WIRING
S P E A K E R O U T P U T S
S P E A K E R O U T P U T S
2
3
4
5
6
7) Ground/Lift:
connecting to equipment that is running on a
different ground system.
8) Balanced Direct Out:
low impedance output to run directly to the PA system
via a 3-pin XLR cable.
Takes the Direct Out signal from
9) Pre/Post EQ:
before or after the EQ section.
10) Direct Out Level:
the Direct Out signal.
11) Speakon Outputs:
Speakon output connectors. Pins 1+ and 1- send a
fullrange signal from the Main (Woofer) amplifi er.
Pins 2+ and 2- send a signal 5kHz and above from the
Horn amplifi er. Use a four-conductor Speakon cable
when connected to a GK Horn Bi-Amp compatible
speaker cabinet. Use a standard two-conductor
Speakon cable when connected to a non-GK cabinet
or if you're using a Speakon to ¼" adapter.
7
D I R E C T O U T
D I R E C T O U T
DIRECT OUT LEVEL
DIRECT OUT LEVEL
GND
GND
POST EQ.
POST EQ.
LIFT
LIFT
GND
PRE
LIFT
POST
-6dBV
500W AMP @ 4 OHMS
500W AMP @ 4 OHMS
PINS 1+/1-
PINS 1+/1-
50W AMP @ 8 OHMS
50W AMP @ 8 OHMS
PINS 2+/2-
PINS 2+/2-
CLASS 2 WIRING
CLASS 2 WIRING
7
8
9
10
11
Used to eliminate hum when
A transformer-balanced
Controls the output level of
High current twist-lock