6
7
Fusion 550 Bass Amplifier
Rear Panel Features
Rear Panel Features
1) AC Receptacle:
Standard IEC Receptacle. The
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 amplifier with the speakers
disconnected.
3) Footswitch:
¼” jack for standard 2-pole latching
footswitch. Switches between Channels and activates
the Mute. To access Channel 1/2 and Tuning Mute
functions via remote foot controller, the Channel 1/2
and Mute Switch located on the front of the amplifier
must be in the up position.
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 amplifiers. The signal to the power amp
is not interrupted when the send jack is used.
7) Ground/Lift:
Used to eliminate hum when
connecting to equipment that is running on a
different ground system.
8) Balanced Direct Out:
A transformer-balanced
low impedance output to run directly to the PA system
via a 3-pin XLR cable.
9) Pre/Post EQ:
Takes the Direct Out signal from
before or after the EQ section.
10) Direct Out Level:
Controls the output level of
the Direct Out signal.
11)
Speakon Outputs:
High current twist-lock
Speakon output connectors. Pins 1+ and 1- send a
fullrange signal from the Main (Woofer) amplifier.
Pins 2+ and 2- send a signal 5kHz and above from the
Horn amplifier. 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.
C
US
TESTED TO:
FOR 120V 60Hz ONLY
E60065 CANADA
UL6500 USA
IEC60065 EUROPE
TESTED TO:
R
Fusion 550
AC INPUT
~120V/60Hz
FULL POWER: 994W
500W AMP @ 4 OHMS
PINS 1+/1-
50W AMP @ 8 OHMS
PINS 2+/2-
CLASS 2 WIRING
CLASS 2 WIRING
5 0 0 W A M P
O N LY
S P E A K E R O U T P U T S
PAT C H B AY
FOOTSWITCH
TUNER
RETURN
SEND
F X
DIRECT OUT LEVEL
POST EQ.
POST
PRE
GND
LIFT
LIFT
GND
-6dBV
D I R E C T O U T
2 3
4
5
6
7
8
11
9 10
1
INPUT
PASSIVE
ACTIVE
CONTOUR
GAIN
800 Hz
500 Hz
DEEP
1.CHANNEL SW
2.MUTE SW
BRIGHT
MICRO CONTROLLER
CHANNEL SW
FOOT SWITCH
TO MOTORIZED POTS
HI-MID
LOW MID
BASS
PRE
POST
DIRECT OUT
LEVEL
BALANCE
TRANSFORMER
FUSION 550 BLOCK DIAGRAM
TREBLE
SEND
RETURN
MASTER
HORN
ACTIVE HI
PASS FILTER
500W / 4 OHMS
POWER AMP
50W / 8 OHMS
POWER AMP
SPEAKON
OUTPUT
QUARTER INCH JACK
OUTPUT
BALANCE
DIRECT OUT
GROUND
LIFT
TUNER
MUTE
1+
3
2
1
2+
1-
2-
1+
2+
1-
2-
Summary of Contents for Fusion 550
Page 1: ...Fusion 550 Owner s Manual ...
