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Horn Bi-Amp Operation:
ways liked the growl they get from a slightly over
driven GK power amp. The problem is that growl
sounds great through woofers but will destroy the
horn (tweeter). In a typical full range system, there is
no way to get that growl while keeping the defini-
tion that the horn provides. In GK's Horn Bi-Amp
system, an active (electronic) crossover allows a full
range signal through to the main (woofer) amplifi er,
while only the high frequency portion of the signal
(5kHz and above) is allowed through to the 50 watt
Horn amplifier. There are three primary benefits
to this system over a traditional full range system.
•
Significantly reduces the risk of blowing out
the horn's diaphragm.
•
More accurate and natural sounding signal
reproduction.
•
Allows you to add as much growl to the woofer
signal as you want while keeping the horn
crystal clear.
Headroom:
The Fusion 550 amplifier uses a
high gain, low noise valve input stage with such
a large dynamic range (60v p-p) that even basses
with active electronics may not need to use the in-
put pad. The benefit to you is a cleaner signal with
less hiss and much less overall noise.
Effi ciency:
The power supply of the Fusion 550
uses a unique design which switches between a
low voltage rail for normal output levels and a
high voltage rail to accommodate peak levels. This
much more efficient approach allows us to build
amplifiers with significantly greater output level
and significantly less heat and weight. We've also
added a temperature sensitive cooling system with
a variable speed fan. Under normal conditions, the
fan will be off or spinning at a low speed. As the
amplifier works harder, the fan speed increases,
maintaining a safe temperature level.
Intelligent Protection Circuitry:
Krueger amplifiers use intelligent protection
circuitry which constantly monitors for any un-
safe operating conditions such as short circuits or
Fusion 550 Bass Amplifi er
Bass players have al-
Gallien-
11
improperly wired speaker cables. If an unsafe condi-
tion is detected, the output signal is immediately mut-
ed and the power light changes from blue to red.
The amplifier will remain muted until the fault is
removed. If the protection circuit activates while
playing, turn the amplifier off and check that you
have not exceeded the maximum recommended
impedance load described in this manual.
The Fusion 550 uses a transformer
Direct Out:
balanced DI (Direct Inject) output for connecting to
PA and recording consoles.This output is calibrated
for 1.0V (0 dBV) and can be adjusted via the Level
control to match the input sensitivity of the mixing
console. A Ground (Gnd) Lift switch is included to
remove hum and buzz when used with equipment
connected to a different ground system. The Post
EQ button allows you to set the Direct Out signal
to either 'Pre' or 'Post' EQ.
Pre EQ: With the Pre/Post EQ button out (Pre),
the Direct Out signal is fed straight from the
input stage and is only effected by the -10dB Pad,
Tuning Mute, and the Direct Out Level control.
Adjustments to the voicing filters or EQ section
will have no effect on the Direct Out signal.
Post EQ: With the Pre/Post EQ button in (Post),
any changes you make in the Gain, Shaping fil-
ters, EQ section and Effects Loop (if used) will
affect the Direct Out signal going to the mixing
console.
A Final Word: You should now have a thorough
understanding of how your new GK amplifier
works and the advantages it offers in helping to
get 'YOUR' sound. If you have any questions or
comments, please visit our web site at www.gallien-
krueger.com or send us an e-mail to info@gallien.
com. We wish you the best of times on your musical
journey wherever it may lead you.
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