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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 equalizers 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 equaliz-

ers 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

amplifiers reflects 30 years of continuous develop-

ment and refinement. The GK equalizer is unique to

the industry, it's not just a normal four band equal-

izer, each section is a special circuit optimized to

perform a Bass specific job in its range of operation.

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

another creating a tremendously flexible equalizer,

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

might even get to hear that sound in your head.

Voicing Filters:

Voicing filters are used to completely re-voice the

amplifier. 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

amplifiers.

The way a Bass amp deals with the instrument low

string is a critical part of it's sound. In fact, a five

string instrument 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 five string instruments. For

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

four string instrument...at least now, you have a

choice!

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

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

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

2001RB & 2001RBP

Technology. We use field effect devices with the gate

biased in a way that emphasizes the optimum har-

monic 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

generates about half the heat of conventional

amplifiers. 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 moni-

tors for unsafe operating conditions such as short

circuits, mis-wired speaker cables, blown speakers,

improper ventilation and incorrect speaker configu-

rations. In addition, protection is provided during

power up/down. If the 2001RB senses any unsafe

operating conditions, the output signal is immedi-

ately muted and the power light changes from Blue to

flashing orange. The amplifier will remain muted

until the fault is removed. If the protection circuit

activates while playing, turn the amplifier off and

check the amplifier 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 amplifier 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 attenuator to be set. The benefit to you

is less hiss from your horn, and over all, much less

noise.