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Gallien-Krueger MB150S-112III オーナーズマニュアル

Tech Talk

MB Series Overview:

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

amplifier, 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 cus-

tomizing your sound.

A high headroom gain stage for low noise

operation.

GK's proprietary Valve Effect for extra

growl

· ·

Class "H" design for better efficiency.

Intelligent protection circuitry which con-

stantly 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 equal-

izers are intended for room equalization and make

poor instrument 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 equal-

izer 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 ac-

commodate 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 em-

phasizing the lows and highs. Additionally

it compensates to keep the overall playing

volume constant. With it's variable con-

trol, the contour will accommodate every-

thing 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 'open-

ness' in your tone. This is particularly

useful when soloing or playing chords.

Limiter:

When the upper level of an amplifier's usable dy-

namic 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 pos-

sible. This is accomplished by using a limiter. A

limiter sets a ceiling called the 'threshold', which

restricts peak signals from exceeding the threshold

point, allowing you to play at a higher overall vol-

ume level with less noise and less risk of distortion.

While more limiting means increased headroom, it

can also rob the dynamic range from your signal.

Be careful not to overdo it.