Genz Benz GBE 1-12T Owner's Manual

GBE
series1
B A S S C O M B O
MODELS: GBEseries1-12T, GBEseries1-15T, GBEseries1-210T
OWNER'S MANUAL
These GENZ BENZ combos have been designed with the professional working musician and week-end
warrior in mind, and are great for rehearsals, small to medium sized clubs, church ensembles or studio
work.
The Series 1 combines proven classic circuitry with state-of-the-art integrated electronic power modules
to deliver the sound quality and features desired by today's sophisticated bass players.
The unique Bi-Amp Output feature divides the pre-amp signal with an asymmetrical built-in crossover
and sends the low frequencies to the cone woofers and the high frequencies to the compression
tweeter. This design allows each amplifier to work more efficiently and the result is a much more clear
and dynamic sound, rivaling amps with much higher power ratings.
FEATURES:
130W RMS woofer amp and 45W RMS tweeter amp, internal 3K Hz crossover, Passive and Active in-
puts, XLR transformer balanced direct output with a rear- mounted ground lift, 3 bands of EQ, effects
loop w/send control, Master volume control separate front panel Tweeter level control. All color coded
level controls, premium GENZ BENZ speaker components, plywood construction, 18 gauge perforated
metal grills, quality durable black carpeting.
OPERATION:
Passive Input - This input has an impedance of 300K ohms, twice the gain of the active input. This input
is designed for the pick-ups on passive basses.
Active Input - This input has an impedance of 47K ohms. The lower impedance combined with this in-
puts lower gain, improves noise rejection and reduces the chances of input overload from basses with
active pick-up circuitry.
Input Gain Stage - The input gain stage uses a variable feed back divider circuit to reproduce the sound
characteristics of the vacuum tube pre-amplifier across the gain spectrum. While this topology may
cause a slight noise while moving the control at some gain positions, due to the open loop amplification
of the divider circuit, this is a reliable way to create this desirable vacuum tube sound.
Equalization - 3 bands of EQ using passive multi-pole filters inserted in the feedback loop of the equali-
zation amplifier give the bass player subtle and natural control over the instruments sound.
Effects Loop - This insert loop, intended for use with many types of digital processing devices is post
equalization and driven by it's own buffer amplifier and send level control to insure reliable interface with
all processors. Under most conditions, the level control will be used in the fully clockwise position. If this
level produces overload in the effects device, reducing the send volume will eliminate the problem. It
may be necessary to increase the output level of the effects device to recover some of the lost gain, if
the processor does not do this automatically.
Master Volume - This post equalization, post effects volume control adjusts the overall volume of the sig-
nal sent to both the low and high frequency amplifiers. Under normal conditions, it is designed to pro-
duce optimum results when set at the TWO OR THREE o'clock position. At this position, all gain stages
are effectively optimized for stage use. If the master volume is set too low, there will be inadequate gain