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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 is used to completely revoice the ampli-

fier. 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 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 1001RB-II/700RB-II Series does just that.

When it is out, the 1001RB-II/700RB-II is voiced like

the 800RB. Push it in and the 1001RB-II/700RB-II is

voiced for five string instruments. For some playing

styles you may want it in, even with a four string

instrument.

Low Noise Operation:

The 1001RB-II/700RB-II Series uses a high gain,

high headroom, low noise input stage. It has such a

large dynamic range (60v p-p) that very few instru-

ments 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.

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

As in all GK pre-amps, the 1001RB-II/700RB-II Series

pre-amp incorporates what we call G.I.V.E (Gate

Induced Valve Effect) Technology. We use field effect

devices with the gate biased in a way that emphasizes

the optimum harmonic content of the signal. Work-

ing 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 1001RB-II/700RB-II Series 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

700RB-II/1001RB-II Series

a low speed, reducing fan noise. As the amp works

harder, the fan speed increases to keep everything

cool.

Smart Protection Circuitry:

The 1001RB-II/700RB-II's protection circuitry

constantly monitors for unsafe operating conditions

such as short circuits, miss-wired speaker cables,

blown speakers, improper ventilation, and incorrect

speaker configurations. In addition, protection is

provided during power up/down. If the 1001RB-II/

700RB-II senses any unsafe operating conditions, the

output signal is immediately muted and the power

light changes from Blue to Red. 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.

If the problem persists, contact GK directly for techni-

cal advice.

Speakon Cables

To make use of the 1001RB-II/700RB-II's Bi-Amp

feature you will need to use the four conductor

Speakon style cable (provided with the 1001RB-II/

700RB-II head, and built into the combos for connec-

tion to the internal speaker) to connect to a GK RBH/

SBX Series cabinet. This specially designed cable

carries the signals for both amplifiers (700W/480W

Woofer Amp and 50W Tweeter Amp) to the speaker

cabinet. Below is a table describing the Speakon

cable connections to the 1001RB-II/700RB-II head

and combos.

Speakon Pin #

To obtain an additional 4 conductor Speakon cable

for use with the 1001RB-II/700RB-II please contact

your local dealer or contact GK directly.

In Closing:

You should now have a thorough understanding of

how your new 1001RB-II/700RB-II Series amplifier

works and what advantages it can offer you in getting

"your" sound. We thank you for reading the Owner's

Manual and wish you the best of times! Please send

us your comments via www.gallien-krueger.com or

email us at [email protected].

Signal

Woofer/Main Amp +

Woofer/Main Amp -

50W /Tweeter Amp +

50W /Tweeter Amp -