400RB-IV Series
Sound Tips
The 400RB-IV Series has several unique features
which, if used properly, will obtain that sound you
have been searching for.Sound Tips
The Equalizer:Boost/Master:
The Equalizer is used to fine tune your sound. WhenTurning up the Boost control, will add a little growl to
adjusting it, do it just a little at a time. These areyour tone. This is an unmistakable GK trade mark
active circuits, and small changes can make a bigsound, that you will grow to appreciate. Raising the
difference in your sound. With a little experimenta-Boost while lowering the Master will add more growl
tion you will find that this equalizer is very easy towhile keeping the sound level the same. Growl is
use, never sounds weird and provides you with a largeactually a small amount of even order harmonic
variety of great sounds, unique to GK.distortion, that sounds great through a woofer, but
horrible through a horn. For most playing situations,
Contour:the Master is set between 12 & 3 o?clock. The cleanest
Increasing the Contour level will scoop out mid-sound is obtained by setting the Master above 12
range frequencies while boosting the highs and lows.o?clock, and going above 3 o?clock for maximum
The sound, once again, is unique to GK and unavail-power situations.
able on any other Bass amp. Lower contour settings
are recommended for midrange clarity at higherDirect Out:
playing levels. For 800RB voicing, set the contourThe 400RB-IV provides a low noise, high quality
control either on 0 or 10 (Off, On on 800RB).balanced direct out for connection to PA and record-
ing consoles. With the Pre/Post EQ switch set to ?Pre?
String Bass:(Out), the direct output signal is fed directly from our
The way a Bass amp deals with the instrument lowlow noise, high headroom, FET input stage providing
string is a critical part of its sound. In fact, a fivea low noise output superior to external direct boxes
string instrument requires an entirely different lowand impedance transformers. In addition, this output
end response than a four string instrument. Nois calibrated for 1.0V (0 dBV) output. With the switch
equalizer can make the necessary adjustments toin the Pre position, the Direct Output signal is only
accommodate both. However, the String Bass buttoneffected by the -14dB Pad and Tuning Mute controls.
on the 400RB-IV Series does just that. When it is out,This allows you to adjust your tone and volume on
the 400RB-IV is voiced like the 800RB. Push it in andstage without changing the Direct Output signal level
the 400RB-IV is voiced for five string instruments. Forand confusing your sound man.
some playing styles you may want it in, even with a
four string instrument.Changing the Pre/Post EQ switch to ?Post? ( In),
sends the ?GK sound? and preamp response to the
Direct Out jack. This gives you complete control over
the Direct Out?s tone and volume. In addition, a
Ground (Gnd) Lift switch is included to remove hum
and buzz when connecting to equipment powered by
a different ground system.
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ACEC
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