Gallien-Krueger Fusion 550 Benutzerhandbuch - Seite 10
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Tech Talk
GK amplifiers are designed to be flexible and
user-friendly for maximum performance. This is
accomplished through these important features:
High Current Capability: When a power amplifi er
is pushing a speaker cone and it needs to reproduce a
high-power transient like a string slap, the amp must
be able to deliver a high current pulse to maintain
cone control. If the amplifi er can't do this it simply
cuts the transient off, producing an unresponsive
less out front sound. Creating these high current
pulses requires extra power devices (four times the
current required to deliver its rated power), larger
supply capacitors, and intelligent protection logic.
GK is the only instrument amplifi er manufacturer
that goes to the trouble and expense, and it is a big
reason why GK amplifi ers sound louder and cleaner
than other brands at the same power rating.
Active Equalization:
There are a wide variety of
equalizers used in instrument amplifi ers today. Passive
equalizers are great but only allow you to cut (signal
loss), not boost (signal gain). Graphic equalizers
provide plenty of variation, but are much better for
room equalization. When used with instruments, they
tend to sound unnatural or synthetic. The equalizer in
GK amplifi ers is unique in the industry and refl ects over
30 years of continuous development and refi nement.
We've developed a rotary, four-band, vacuum tube
active equalizer optimized for bass guitar. The
active circuitry allows you to either boost or cut at
a given frequency with greater integrity in signal
reproduction. The treble is a shelving type control
that boosts the high frequencies evenly. Respectively,
the bass is a shelving control that evenly boosts the
low frequencies. The high mid and low mid are peak
(bandpass) type controls with wide Q (bandwidth)
patterns which are much more 'musical' sounding.
Each of the four bands are connected in series, meaning
the output of the fi rst band is fed directly into the input
of the next and so on. This eliminates the rippling or
combing effect that can happen with parallel EQ circuits.
The overall result from all of this is an equalizer that's
fl exible, yet easy to use and sounds natural even at
extreme settings.
Fusion 550 Bass Amplifi er
10
Shaping: The three-stage shaping fi lter simplifi es
the process of shaping and coloring your tone,
enabling the amplifier to accommodate a wide
variety of playing styles with minimal fuss.
Contour:
The Contour is a tube-driven version
of the contour circuit from the 800RB. It adds a
variable control and center frequency select for
precise tone shaping. With the control at zero, the
response is essentially 'fl at', as in no shaping. As
the contour is increased, it scoops out the midrange.
Additionally, it compensates to keep the overall
volume level constant. With it's variable control,
the Contour will accommodate everyone from the
smooth fi nger-style player to the aggressive slap
player.
Deep: The Deep switch extends the low frequency
range of the amplifi er to accommodate the extra low
range of the B string on 5 and 6 string bass guitars.
4 string players may also fi nd desirable results with
this fi lter as well.
Bright:
The Presence control adds extra sparkle
on the high-end for better clarity and 'openness' in
your tone. This is particularly useful when soloing
or playing chords.