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TECHNICAL MANUAL
DESIGN PHILOSOPHY
With many years of experience designing and manufacturing both bass guitar speaker cabinets and amplifi ers, it
became obvious that there is a large market for a bass amplifi er line that reproduces the natural tone of the
instrument itself, while allowing for personalization of tonal texture.
As with our speakers, Genz Benz amplifi ers are designed to maximize your instrument's natural tone and feel
without imparting additional unwanted coloration or reducing impact and playability. This results in an amplifi er that
will always be true to your instrument's basic natural qualities and your personal tonal signature.
The circuit design, features and physical construction have been carefully developed to give you, the experienced
player, and the best performance in bass guitar amplifi cation. Featuring sturdy jacks and controls, premium 12AX7
TUBE and solid state FET front end pre-amps, tuner output, mute switch, active/passive switch, foot switchable
channels and shaping fi lters, dual 5 band active EQ, balanced direct output and an industrial duty bipolar power
amplifi er with toroidal power transformer, the Genz Benz GBE 750 bass amplifi er gives you the tools and versatility
necessary to sound your very best on stage.
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Summary of Contents for Genz Benz GBE 750
- Page 1 fi lters, dual 5 band active EQ, balanced direct output and an industrial duty bipolar power amplifi er with toroidal power transformer, the Genz Benz GBE 750 bass amplifi er gives you the tools and versatility necessary to sound your very best on stage.
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Page 2: Technical Information
The fi rst stage of the GBE 750 preamp uses a low noise bi-FET linear scaling amplifi er with a 2 pole low cut point at 23 Hz to prevent excessive speaker cone excursion and intermodulation distortion. Additional bandwidth roll-off is provided at 20 kHz for RFI suppression. - Page 3 Active 5 Band Equalization — The “active 5 band equalization” used in the GBE 750 amplifi er is composed of 1 shelving low frequency control, 3 peaking midrange controls and 1 shelving high frequency control. These fi lters are...
- Page 4 High Frequency - 4000 Hz and above Global Signal Shaping Switches and Controls — There are 3 separate shaping fi lters on the GBE 750. The “L.F. EXTEND” (low frequency extend) lowers the low frequency roll-off response of the preamp (between 30 and 45 Hz) to allow the full effect of 5+ string and extended scale instruments.
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Page 5: Back Panel
“PRE” position will be somewhat lower than in the “POST” position. Foot Switch — The GBE 750 is fi tted with a 6 pin DIN jacks for the 5 button footswitch (included). In order for the footswitch to function correctly, the amplifi er’s front panel switches for these functions must be in the “out” position. -
Page 6: Specifications
Only persons familiar with the operation of high-powered audio equipment should attempt to operate this device. In addition, by the use of this device, user agrees to hold both GENZ BENZ and its designers, sales agents and all other affi liates and related parties harmless in the event of any accident, injury, damage or loss resulting from such use. -
Page 7: Three-Year Limited Warranty
Genz Benz warrants the GBE 750 amplifi er to be free from defects in materials and workmanship, for a period of 3 years from the date of purchase, when purchased from an authorized Genz Benz dealer. This warranty does not cover wear and tear incurred from the normal designed use of the product.