Gallien-Krueger 2001RBP Owner's Manual - Page 18

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Tech Talk

Equalization:

The sound you want is in your head, but you just can't get

it. You think it's you, your bass or maybe your amp. Yes,

your amp. Standard tone controls and graphic equal-

izers don't get it. Sure, they give you plenty of variation,

but they don't provide what the instrument really needs.

The fact is, graphic equalizers are intended for room

equalization, and are only put in bass amps because it's a

no-brainer for the designer. The equalization in Gallien-

Krueger ampliﬁ ers reﬂ ects 30 years of continuous develop-

ment and reﬁ nement. The GK equalizer is unique to the

industry, it's not just a normal four band equalizer, each

section is a special circuit optimized to perform a Bass

speciﬁ c job in its range of operation.

These sections are wired in Series, so they add to one

another creating a tremendously ﬂ exible equalizer, that

doesn't sound weird at any setting. You actually might

even get to hear that sound in your head.

Voicing Filters:

Voicing ﬁ lters are used to completely re-voice the ampli-

ﬁ er. In the case of the Contour and String Bass controls,

the effect is dramatic.

The Contour control tunes between two different shaping

circuits, with greatly different response. With the control

all the way up, the low end is slightly boosted, the mids are

dropped and the high end is pushed up. This is a response

contour not available with a normal equalizer, and is only

found in GK ampliﬁ ers.

The way a Bass amp deals with the instrument low string

is a critical part of it's sound. In fact, a ﬁ ve string instru-

ment requires an entirely different low end response than

a four string instrument. No equalizer can make the

necessary adjustments to accommodate both, however the

String Bass button on the 2001RB does just that. When

it is out, the 2001RB is voiced like the 800RB. Push it in

and the 2001RB is voiced for ﬁ ve string instruments. For

some playing styles you may want it in, even with a four

string instrument...at least now, you have a choice!

2001RB & 2001RBP

"G.I.V.E." Technology:

As in all GK pre-amps, the 2001RB pre-amp incorporates

what we call G.I.V.E (Gate Induced Valve Effect) Technol-

ogy. We use ﬁ eld effect devices with the gate biased in a

way that emphasizes the optimum harmonic content of

the signal. Working in concert with our unique Four Band

Active Equalizer, and three stage Voicing Filter Section,

G.I.V.E. technology produces a consistently pleasing bass

tone.

Cool Running = Reliability:

The 2001RB uses a "dual rail power supply" that gener-

ates about half the heat of conventional ampliﬁ ers. Low

output signals run off a low voltage supply, and high level

signals run off a high voltage supply. This keeps the amp

running a lot cooler and makes it much more reliable. To

cool the amp when its being driven hard, we've designed a

temperature sensitive fan cooling system. When the amp

is under a light load, the fan is off or running at a low

speed, reducing fan noise. As the amp works harder, the

fan speed increases to keep everything cool.

Smart Protection Circuitry:

The 2001RB's protection circuitry constantly monitors for

unsafe operating conditions such as short circuits, mis-

wired speaker cables, blown speakers, improper ventilation

and incorrect speaker conﬁ gurations. In addition, protec-

tion is provided during power up/down. If the 2001RB

senses any unsafe operating conditions, the output signal

is immediately muted and the power light changes from

Blue to ﬂ ashing orange. The ampliﬁ er will remain

muted until the fault is removed. If the protection circuit

activates while playing, turn the ampliﬁ er off and check

the ampliﬁ er speaker output connections. Be sure that

you are not exceeding the maximum recommend load

described in this manual. Also, make sure that you have

connected the ampliﬁ er to your speakers as described in

Bi-Amp and Normal Operation on page 7. If the problem

persists, contact GK directly for advice.

Low Noise Operation:

The 2001RB uses a high gain, high headroom, low noise

input stage. It has such a large dynamic range (60v p-p)

that very few instruments can overdrive it. Even most

basses with "active" electronics do not need the input at-

tenuator to be set. The beneﬁ t to you is less hiss from your

horn, and over all, much less noise.