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Gallien-Krueger Microbass MB150S/112 Gebruikershandleiding

Tech Talk

MB Series Overview:

The MB Series is a flexible, state-of-the-art bass am-

plifier, designed to deliver maximum performance, and

be simple to operate. This is accomplished through a

few, very important features:

· ·

High current capability for better speaker control.

Four bands of active equalization for precise

tone control.

Robust voicing filters for shaping and custom-

izing your sound.

A high headroom gain stage for low noise op-

eration.

· ·

GK's proprietary Valve Effect for extra growl

Class "H" design for better efficiency.

Intelligent protection circuitry which constantly

monitors for unsafe conditions.

High Current Capability:

When a power amplifier 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 amplifier

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 bass amp manufacturer that goes

to the trouble and expense to make this happen and it

is a big reason why GK amplifiers sound louder and

cleaner than other brands at the same power rating.

Active Equalization:

Standard tone controls and graphic equalizers give you

plenty of variation, but they don't provide what the

instrument really needs. In fact, graphic equalizers are

intended for room equalization and make poor instru-

ment equalizers. The GK equalizer reflects 30 years

of development and refinement and is unique to the

industry. Each section is a special circuit optimized to

perform a Bass specific job in its operation range.

These sections are wired in series so they add to one

another without creating unmusical peaks or valleys.

The result is an equalizer that is easy to use and

sounds natural at any setting.

MicroBass-III Series

Voicing Filters:

Voicing filters are used to completely re-voice the

amplifier in ways that an equalizer cannot. They are

extreme filters enabling the amplifier to accommodate

a wide variety of playing styles with the simplest

adjustments.

The Contour is based on the same contour

circuit as the 800RB, but adds a variable

control for precise tone shaping. With the

control at zero, it matches the 800RB con-

tour switch 'out' or off, and when turned all

the way up, it matches the 800RB contour on.

As the contour is increased, it scoops out the

mid frequencies while emphasizing the lows

and highs. Additionally it compensates to

keep the overall playing volume constant.

With it's variable control, the contour will

accommodate everything from the smooth

finger-style player (set flat or off), to the

aggressive slap player (fully scooped).

The Low Cut filter rolls off the low end early

in the signal path (before the EQ) which

works well for four string players going for a

heavy rock stage sound where too much bass

interferes with the room.

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.

Limiter:

When the upper level of an amplifier's usable dynamic

range is exceeded, audible signal distortion will occur

which can damage speakers. Reducing the volume

would create more headroom, but also increases the

signal to noise ratio. It is therefore necessary to keep

the volume level as high as possible. This is accom-

plished by using a limiter. A limiter sets a ceiling called

the 'threshold', which restricts peak signals from ex-

ceeding the threshold point, allowing you to play at a

higher overall volume level with less noise and less risk

of distortion. While more limiting means increased head-

room, it can also rob the dynamic range from your sig-

nal. Be careful not to overdo it.