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Bi-Amp systems allow the crossover to be electronic
and therefore, have much higher quality than passive
crossovers. A crossover separates the sound into two
parts (high and low frequency). The highs are sent to
the horn or high frequency cabinet and the lows are
sent to the woofer. In an ideal system, adding the
highs and the lows back together would recover the
original signal. Most passive Bass systems have very
poor crossovers, resulting in severe signal corruption.
When these signals are added back together (as in
your ear), they have very little in common with the
original signal. The 700RB Series uses a Constant
Voltage crossover which results in very little signal
corruption. In fact, when the high and low signals
are added back together, the result is extremely close
to the original. This makes a two-way system sound
more seamless, and less artificial. We have also
included a Tweeter Hi-Cut switch in the crossover,
which rolls the tweeter off above 10kHz giving it a less
glassy, more cone like sound.
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 equalizers are intended
for room equalization, and are only put in bass amps
because it's a no-brainer for the designer. The equaliza-
tion in Gallien-Krueger amplifiers reflects 30 years of
continuous development and refinement. 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 specific job in its range of
operation. These sections are wired in Series, so they add
to one another creating a tremendously flexible equal-
izer, that doesn't sound weird at any setting. You actually
might even get to hear that sound in your head.
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 re-
sponse than a four string instrument. No equalizer can
make the necessary adjustments to accommodate both,
however the String Bass button on the 700RB Series does
just that. When it is out, the 700RB is voiced like the
800RB (the world's classic four string amp). Push it
in and the 700RB 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!
As in all GK pre-amps, the 700RB 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. 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.