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ULTRATWIN GX212
1.1 Design concept
The philosophy behind BEHRINGER products guarantees a no-compromise circuit design and employs the
best choice of components. The operational amplifiers used in the ULTRATWIN are exceptional: they boast
extreme linearity and very low distortion characteristics. To complement this design, the choice of components
include low-tolerance resistors and capacitors, high-quality potentiometers and several other stringently selected
elements.
The ULTRATWIN uses SMD technology (Surface Mounted Device). These subminiature components adapted
from aerospace technology allow for an extreme packing density to further improve the overall reliability.
The super-robust steel-plate enclosure of your ULTRATWIN, with its generously dimensioned power supply,
ensures that your GX212 will never fail on the stage even when the going gets tough. The enclosure is made
of high-grade and non-polluting E1-MDF wood, which consists of multiple tongued/glued layers and is absolutely
free of formaldehyde.
1.1.1 VIRTUBE technology
Tube preamps usually employ three to five triode stages in a series configuration, producing different degrees
of distortion, dynamic compression and frequency response modification. In addition to the characteristic
curve that determines the signal distortion, the order of filter and distortion stages also plays an important role.
While you can enhance the sound of clean and slightly distorted signals by adding some bass before feeding
them into the distortion stage, the same equalization will lead to a fuzz-like, undifferentiated sound with
hi-gain signals. For this reason, tube amplifiers have some sort of passive and usually straightforward filter
circuitry installed between the single preamp stages. Using these filters you can determine which frequencies
will have an impact on the signal distortion.
Additionally, filter circuits following the distortion stage serve to provide for an optimum blend of generated
upper harmonics in the output signal. Our VIRTUBE circuits have been designed to accurately simulate this
complex interaction with solid-state components. The EQs and filters between the single stages are modeled
on the circuitry found in classic tube amps. The non-linear characteristic curves are simulated by means of
specially selected diodes. The result is an amplifier whose sounds feature a pronounced tube character.
1.1.2 Morphing
The BEHRINGER ULTRATWIN amplifiers are equipped with a special circuit that gives you enormous flexibility
using the overdrive channel. Owing to the rich upper harmonics spectrum of distorted sounds, the subsequent
filter circuits have quite a drastic effect on the overall sound, which is why it seemed only natural to allow for a
variety of creative filter options.
Therefore, the BEHRINGER morphing circuit uses a tunable filter in addition to a classic 3-band EQ and
dedicated presence control. This filter allows you to create new sound nuances that would be impossible with
traditional passive EQs. Add to this the mid boost button, the overdrive control, the musically aligned presence
control and the passive 3-band EQ, and youll have a range of fantastic options available to tailor the sound
perfectly to your personal needs.
1.2 Before you begin
Your BEHRINGER ULTRATWIN was carefully packed in the factory and the packaging is designed to protect
the unit from rough handling. Nevertheless, we recommend that you carefully examine the packaging and its
contents for any signs of physical damage, which may have occurred during transit.
+ If the unit is damaged, please do not return it to BEHRINGER, but notify your dealer and the
shipping company immediately, otherwise claims for damage or replacement may not be
granted. Shipping claims must be made by the consignee.
Be sure that there is enough space around the unit for cooling and please do not place the ULTRATWIN on high
temperature devices such as radiators etc. to avoid overheating.
+ Before you connect your ULTRATWIN to the mains, please make sure that your local voltage
matches the voltage required by the unit!
1. INTRODUCTION
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