Cool Running; Smart Protection; Speakon Cables; Low Noise Operation - Gallien-Krueger 700RB series Owner's Manual

The 700RB 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 a low speed, reducing fan noise. As the
amp works harder, the fan speed increases to keep
everything cool.
The 700RB's protection circuitry constantly monitors for
unsafe operating conditions such as short circuits, miss-
wired speaker cables, blown speakers, improper ventila-
tion and incorrect speaker configurations. In addition,
protection is provided during power up/down. If the
700RB senses any unsafe operating conditions, the
output signal is immediately muted and the power light
changes to from Green 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. Also, check to see that you
have connected the amplifier to your speakers as de-
scribed in Bi-Amp and Normal Operation on page 7. If
the problem persists, contact GK directly for advice.
The 700RB Series 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" electron-
ics 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.
To make use of the 700RB's Bi-Amp feature you will
need to use the four conductor Speakon cable (provided
with the 700RB head, and included with the combos for
connection to the internal speaker) to connect to a GK
RBH Series cabinet. This specially designed cable carries
the signals for both amplifiers (380W Woofer Amp and
50W Tweeter Amp) to the speaker cabinet. Plus, they are
the coolest speaker connectors currently available. Below
is a table describing the Speakon cable connections to the
700RB head and combos.
Speakon Pin # Signal
1+ 380W Woofer Amp +
1- 380W Woofer Amp -
2+ 50W Tweeter Amp +
2- 50W Tweeter Amp -
To obtain an additional 4 conductor Speakon cable for
use with the 700RB please contact your local
dealer or contact GK directly.
You should now have a thorough understanding of how
your new 700RB 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
sales@gallien.com.
WireColor
White
Black
Red
Green