6
400RB Series
Sound Tips
The 400RB Series has several unique features which,
if used properly, will obtain that sound you have been
searching for.
The Equalizer:
The Equalizer is used to fine tune your sound. When
adjusting it, do it just a little at a time. These are
active circuits, and small changes can make a big
difference in your sound. With a little experimenta-
tion you will find that this equalizer is very easy to
use, never sounds weird and provides you with a large
variety of great sounds, unique to GK.
Contour:
Increasing the Contour level will scoop out mid-
range frequencies while boosting the highs and lows.
The sound, once again, is unique to GK and unavail-
able on any other Bass amp.
String Bass:
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 400RB Series does just that. When it is out, the
400RB is voiced like the 800RB (the world’s classic
four string amp). Push it in and the 400RB is voiced
for five string instruments. For some playing styles
you may want it in, even with a four string instru-
ment.
Sound
Tips
Boost/Master:
Turning up the Boost control, will add a little growl to
your tone. This is an unmistakable GK trade mark
sound, that you will grow to appreciate. Raising the
Boost while lowering the Master will add more growl
while keeping the sound level the same. Growl is
actually a small amount of even order harmonic
distortion, that sounds great through a woofer. For
most playing situations, the Master is set between 12 &
3 o’clock. The cleanest sound is obtained by setting
the Master above 12 o’clock, and going above 3
o’clock for maximum power situations.
Direct Out:
The 400RB provides a low noise, high quality
balanced direct out for connection to PA and record-
ing consoles. With the Pre/Post EQ switch set to “Pre”
(Out), the direct output signal is fed directly from our
low noise, high headroom, FET input stage providing
a low noise output superior to external direct boxes
and impedance transformers. The Direct Output
signal is only effected by the -10dB Pad, and Tuning
Mute controls. This allows you to adjust your tone
and volume on stage without changing the Direct Out
signal level and confusing your sound man.
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.
