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Front Panel Controls
1 Balanced Direct Out (MBS Only): An electroni-
cally balanced low Z output. This is permanently set to
Pre-EQ.
2 Ground/Lift (MBS Only): This switch disconnects
the ground on the balanced, XLR output to eliminate hum
and buzz when connecting to equipment that is running on
a different ground system.
3 Input: A standard ¼" input jack to plug in active or
passive basses using an instrument (shielded) cable.
4 -14dB Pad: Reduces the input signal from your bass.
Press in if you hear distortion at low volume settings.
5 Volume: Sets the preamp gain after the input stage.
6 Low Cut: Rolls off the low end, producing a more
"vintage" tone reminiscent of the GK 400B.
7 Contour: Cuts midrange frequencies while boosting
lows & highs. Center frequency is 500hZ.
8 Presence: Adds edge and definition to higher fre-
quencies.
9 Treble: Boost and cut at 5 kHz +5dB/-22dB shelving
type.
10 Hi Mid Frequency (MBE Only): Sets the center
frequency for the Hi Mid control between 620Hz and
6.2kHz.
11 Hi Mid: Boost and cut at 2 kHz +10.5dB/ -7dB, "Q
Optimized," band pass type.
12 Lo Mid Frequency (MBE Only): Sets the center
frequency for the Lo Mid control between 160Hz and
1.6kHz.
13 Lo Mid: Boost and cut at 500Hz +7.5dB/-10dB,
"Q Optimized," band pass type.
14 Bass: Boost and cut at 80Hz +8.5dB, shelving type.
15 Boost (MBE Only): Post EQ gain stage using
GK's exclusive Valve Effect which adds "growl" as it
is turned up. May be engaged with the RF2 Footswitch.
MicroBass-III Series
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16 Stereo Chorus LED (MBE Only): LED is lit when
the Stereo Chorus is engaged.
17 Chorus On/Off Switch (MBE Only): Turns the
Stereo Chorus effect on. This switch is disabled when
the RF2 Footswitch is used.
18 Chorus Rate (MBE Only): Adjusts the speed of
the Chorus effect.
19 Chorus Depth (MBE Only): Adjusts the depth
of the Chorus effect.
20 Output Level: Controls the output level of the
amplifier.
21 Limiter LED: LED is lit when the Limiter is on.
22 Limiter On/Off: Press in to turn the Limiter on.
23 Limiter Level: Varies the power amp output from
20 watts to 150 watts. When using the limiter, start
with the adjustment knob turned fully clockwise. Turn
the knob counterclockwise to decrease distortion.
24 Effects Send (MBS Only): For the insertion of
effects after the EQ, but before the boost section. May
also be used as a line out.
25 Effects Return (MBS Only): When the Return
jack is used, the Effects Loop is 'in series', meaning all of
the signal goes through the Effects Loop.
26 Phones: Stereo¼" output jack for private head-
phone listening.
27 Power/Protect LED: The LED is red for five sec-
onds while the amp powers up, then turns blue when the
amp is ready. Should the amp experience a fault (over
heat, over current) the amp will mute and the LED will
switch to red until the condition is corrected.
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