Gallien-Krueger MB 800 Owner's Manual - Page 6

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1. Quick Start

INPUT

-10dB

MUTE

CLIP

Front Panel Features

Input: A standard ¼" input jack to connect active

or passive basses using a shielded cable.

-10 dB Pad/Clip indicator: This is generally set

to the down position except in cases where the

clip indicator (the ring surrounding the -10dB

switch) flashes more than occasionally. This

indicates the input is being overdriven. If the

-10dB pad is active (up position) and the clip

indicator still flashes frequently, reduce the

volume on your bass.

Mute: Set this switch to on (up) position when

tuning or unplugging your instrument. The input

signal will be sent to the tuner output located on

the rear panel but no signal will be sent to the

speaker or XLR outputs. When the mute is

active, the ring surrounding the mute switch will

be lit red.

Gain A (push): Sets the preamp gain after the

input stage and is used in conjunction with the

input pad to optimize the input signal level sent

through the preamp. Activated by default upon

power up and when the Gain A knob is pressed as

well as from the provided footswitch. The Gain A

knob is lit blue when active.

Gain B (push): Allows an additional preamp

gain level to be set independent of Gain A. When

used in conjunction with the Level B control, the

desired overdrive and output volume can be set

relative to the Gain A level. Activated by

pressing the Gain B knob or by the included

footswitch. Gain B remains active and is lit blue

until Gain A is selected.

Contour: The contour control decreases the

mid-range frequencies while boosting low and

high frequencies.

Treble: Boost and cut at 7 kHz +14 dB shelving

type. Use this control to add or remove edge and

definition.

Hi-Mid: Boost and cut at 1 kHz +6 dB. A "Q

Optimized," band pass type, this works on lower

MB 800

GAIN A

GAIN B

CONTOUR

TREBLE

PUSH A

PUSH B

HI-MID

LO-MID

BASS

string harmonics and effects the punch of your

sound.

Lo-Mid: Boost and cut at 250Hz +6dB/-10 dB. A

"Q optimized" band pass type, this works for the

main body of your sound.

Bass: Boost and cut a 60Hz +10 dB, shelving

type. This is used to control the low end push.

Level B: Activated and is lit blue in conjunction

with Gain B. Sets the volume when Gain B is

selected.

Master (push): Controls the overall output of the

MB800. In addition, pushing the master knob

engages/disengages the limiter function. Upon

powering up the amplifier, the Master knob

indicator is lit blue indicating the limiter is

engaged. When the master knob is pushed the

limiter function is disengaged and the knob

indicator changes to white. If power amp

clipping occurs, the knob indicator will flash red

indicating that the limiter function should be

engaged. The limiter function prevents the power

amp from distorting and is recommended during

high volume applications.

Limiter (Master knob pushed/engaged): When

this button is engaged it prevents the power amp

from distorting. It is recommended that this

feature is used for during high volume

applications.

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.

POWER

LEVEL-B

MASTER

OFF

PUSH LIM

MB 800