Front Panel Controls; Front Panel Features; Top Panel Features - Gallien-Krueger MB FUSION Owner's Manual

INPUT
GAIN-A
-14dB MUTE
OFF OFF
ON ON
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Front Panel Features

Input: A standard ¼" input jack to connect active
1
or passive basses using a shielded cord.
-14 dB Pad/Clip indicator: Input attenuator
2
button. This button is generally set to the out
position except in cases where the input signal
overloads causing distortion. It may be necessary
to "pad" the input if you are using a bass with
active electronics or very high output. If the -14dB
is pressed and the signal distorts at lower settings
reduce the volume on your bass.
Mute: Set this switch to "on" when tuning or
3
unplugging your bass. No signal will be sent to the
speakers or the P.A. system. When muted this
button turns red.
Gain A: Sets the preamp gain after the input stage.
4
It is used in conjunction with the input pad to
control the signal level sent throughout the
amplifier.
Gain B: Allows an additional input level setting to
5
be preset and activated via footswitch or from the
front panel's A/B button. When used in
conjunction with the Master B knob, varying the
amounts of tube overdrive and volume are
available.
Contour: As part of the amps active equalization
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the contour control decreases the mid-range
frequencies while boosting low and high
frequencies.
Treble: Boost and cut at 7 kHz +14 dB shelving
7
type. Use this control to add or remove edge and
definition.
Hi-Mid: Boost and cut at 1 kHz +6 dB. A "Q
8
Optimized" band pass type, this works on lower
string harmonics and effects the punch of your
sound.
MB FUSION
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GAIN-B CONTOUR TREBLE HI-MID
8
5 6 7
9
10
11
12
13
14
15
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6
LOW-MID BASS MASTER-A
A
B
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Low-Mid: Boost and cut at 250Hz +6dB/-10 dB.
A "Q optimized" band pass type, this works for
main body of your sound.
Bass: Boost and cut a 60Hz +10 dB, shelving type.
This is used to control the low end push.
A/B: This button activates the Gain B and Master
B volume control. This can also be activated using
the foot switch (included).
Master A: This is the master volume control when
the boost is inactive.
Master B: This is the master volume control when
boost is activated.
Power Switch: Turns the amplifier on and off. In
the on position, the ring surrounding the button
will light red during power up then changes to
blue, indicating the amp is ready for normal
operation. Should the amp experience a fault (over
heat or over current) the amp will mute and the
ring will light red until the condition is corrected.
This LED turns off when the power is switched
off. This turns the amp off but it does not
completely disconnect the power from the AC
mains.

Top Panel Features

Contour: The Contour switch activates a tube
driven version of the contour circuit from the RB
series. It adds a variable control
frequency select for precise tone shaping. With the
control a zero, the response is 'flat' as in no
shaping. As the Contour is increased, it scoops out
the midrange. Additionally, it compensates to keep
the overall volume level constant.
Presence: 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. (continued on pg. 7)
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POWER
MASTER-B
OFF
ON
MB FUSION
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and center