Behringer ULTRATWIN GX212 User's Manual

Version 1.0, May 2001

Safety Instructions

CAUTION: To reduce the risk of electrical shock, do not remove the cover (or back). No user serviceable parts inside; refer servicing to qualified personnel.

WARNING: To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture.

The symbol ⚠️ (risk of electric shock) alerts you to the presence of uninsulated dangerous voltage inside the enclosure that may be sufficient to constitute a risk of shock.

The symbol ⚠️ (warning) alerts you to important operating and maintenance instructions in the accompanying literature. Read the manual.

Detailed Safety Instructions:

All safety and operation instructions should be read before the appliance is operated.
Retain Instructions for future reference.
Heed all warnings on the appliance and in the operating instructions.
Follow all operation and user instructions.
Water and Moisture: Do not use near water (e.g., bathtub, washbowl, kitchen sink, laundry tub, wet basement, swimming pool).
Ventilation: Do not block ventilation openings. Ensure adequate space for airflow.
Heat: Situate away from heat sources (radiators, heat registers, stoves, other appliances).
Power Source: Connect only to the type described in operating instructions or marked on the appliance.
Grounding or Polarization: Ensure grounding or polarization means are not defeated.
Power-Cord Protection: Route cords to prevent them from being walked on or pinched.
Cleaning: Clean only as recommended by the manufacturer.
Non-use Periods: Unplug the power cord when left unused for a long period.
Object and Liquid Entry: Prevent objects from falling and liquids from spilling into the enclosure.
Damage Requiring Service: Service by qualified personnel when: power cord/plug is damaged; objects fallen/liquid spilled; exposed to rain; does not operate normally; dropped or enclosure damaged.
Servicing: Do not attempt to service beyond operating instructions. Refer all other servicing to qualified personnel.

Foreword

Dear Customer,

Welcome to the team of ULTRATWIN users. This manual marks the culmination of months of hard work by the BEHRINGER engineering team to deliver an out-of-the-ordinary guitar workstation. The GX212 offers superior sound quality, easy operation, and advanced technical specifications at an affordable price for musicians.

BEHRINGER is committed to providing high-grade devices at low prices, made possible by customer feedback and large sales volumes. This philosophy ensures uncompromising quality and excellent technical/audio properties, enabling musicians to unfold their creativity without budget constraints.

Special thanks are extended to the users of BEHRINGER equipment, Jan, Thorsten, Volker, and all others who contributed to the "Project ULTRATWIN GX212".

Sincerely,

Uli Behringer

Product Features

ULTRATWIN®: Ultra-flexible 2 x 60 Watt Guitar Workstation with Digital Multi-Effects Processor

Powerful 2 x 60 Watt RMS Guitar Workstation with authentic VIRTUBE® tube emulation.
Two original 100 Watt heavy duty SHARK 12" guitar speakers (model 12G100A).
Two independent channels with separate volume controls, EQ, and effects.
CLEAN channel delivers clean and slightly distorted tube sounds.
OVERDRIVE channel offers a broad range from modern crunch to high-gain sounds.
Unique Morphing control allows blending between various distortion characteristics.
Dedicated vintage-type 3-band EQ.
24-bit stereo multi-effects processor with ultra-high resolution 24-bit AD/DA converters.
31 original VIRTUALIZER®/MODULIZER® presets with world-class effects (Reverb, Delay, Phaser, Chorus, Flanger, Pitch Shifter, Speaker Simulator, Rotary Speaker, Magic Drive, Compressor, Expander, Wah, Tube Emulator, and combinations).
99 outstanding and easy-to-edit user presets.
Quasi-analog operation: three FX parameters per preset can be edited with dedicated controls.
Adjustable aux and tape input for playback or other line-level signals (e.g., CD player, drum computer).
Frequency-corrected stereo line output for recording and live applications.
Additional speaker outputs.
Insert facility for external effects devices (stomp boxes, wah-wah pedals, etc.).
Channel select and effect bypass footswitch FS112 included.
Complete MIDI implementation for channel and effect selection, and real-time control.
Master volume control and frequency-corrected stereo headphones output.
Extremely rugged construction for long life.
Robust power supply for excellent transient response.
Manufactured under ISO9000 certified management system.

Introduction

Thank you for purchasing the BEHRINGER ULTRATWIN GX212. This guitar workstation sets new standards in amp engineering, combining authentic classic guitar amp sound with advanced DSP technology and an intuitive user interface.

BEHRINGER has a long history of developing audio products for studio and live applications, including microphones, 19" rack devices, and speakers. The BEHRINGER name signifies no-compromise quality, feature-rich products, and excellent service at affordable prices.

Flexibility is key for modern guitarists. The ULTRATWIN GX212 offers a comprehensive set of functions for various applications like home recording, studio, and live concerts, ensuring intuitive and quick operation.

Unlike many conventional guitar amps, the ULTRATWIN is packed with advanced features. It offers significantly more functions than a typical 2-channel amp with spring reverb, while still being able to emulate a classic 2-channel combo amp sound. Familiarize yourself with all functions to fully exploit the amp's capabilities.

BEHRINGER continuously improves its products based on user feedback. The GX212's effects modules use EPROMs that can be updated, ensuring the amp remains current with new algorithms and user suggestions. Software updates are available for free online.

This project involved many contributors, including studio musicians, vintage amp collectors, and guitar enthusiasts. The goal was to create an amplifier offering the best of all worlds: sophisticated analog technology, perfect tube simulation, latest DSP effects, rugged construction, and intuitive operation.

This manual provides detailed information on the ULTRATWIN's terminology and functions. Please read it carefully and keep it for future reference.

1.1 Design Concept

BEHRINGER's philosophy emphasizes no-compromise circuit design and the use of high-quality components. The ULTRATWIN utilizes exceptional operational amplifiers for extreme linearity and low distortion. Low-tolerance resistors, capacitors, and high-quality potentiometers are also employed.

The unit uses SMD technology for compact design and improved reliability. Its super-robust steel-plate enclosure, with a generously dimensioned power supply, ensures durability. The enclosure is made of high-grade, non-polluting E1-MDF wood.

1.1.1 VIRTUBE Technology

VIRTUBE technology simulates the characteristics of tube preamps, including distortion, dynamic compression, and frequency response modification. It uses filter circuits and specially selected diodes to accurately replicate the complex interactions found in classic tube amps, resulting in a pronounced tube character.

1.1.2 Morphing

The ULTRATWIN features a special morphing circuit for the overdrive channel, offering enhanced flexibility. It includes a tunable filter, a 3-band EQ, and a presence control, allowing for creative sound shaping and unique nuances not possible with traditional EQs.

1.2 Before You Begin

Your ULTRATWIN was carefully packed to protect it during transit. Inspect the packaging and unit for any signs of physical damage. If damaged, notify your dealer and the shipping company immediately; do not return it to BEHRINGER. Shipping claims must be made by the consignee.

Ensure adequate space around the unit for cooling and avoid placing it on high-temperature devices. Before connecting to mains power, verify that your local voltage matches the unit's required voltage.

Control Elements

The ULTRATWIN GX212 features a comprehensive set of controls on its front and rear panels.

1.3.1 Front Panel

The front panel includes 16 controls, six push-buttons, a 2-digit LED display, and two 1/4" jacks.

1. INPUT JACKS (HI/LO): 1/4" PHONE JACK INPUTS for connecting your guitar. The HI INPUT is for low-output guitars (single coil pickups), and the LO INPUT is for high-output guitars (humbuckers). Use a quality 1/4" mono cable with good shielding.
2. CLEAN VOLUME: Controls the volume of the CLEAN channel.
3. CLEAN BASS: Adjusts bass frequencies in the CLEAN channel EQ.
4. CLEAN MID: Adjusts midrange frequencies in the CLEAN channel EQ.
5. CLEAN TREBLE: Adjusts upper frequency range in the CLEAN channel EQ. Note: With all CLEAN EQ controls set to minimum, no signal may be sent to the speaker due to the EQ circuit design.
6. CHANNEL BUTTON: Toggles between CLEAN and OVERDRIVE channels. An LED indicates when the OVERDRIVE channel is active.
7. OVERDRIVE CONTROL: Adjusts the degree of distortion in the OVERDRIVE channel.
8. MID BOOST BUTTON: Increases midrange frequencies in the OVERDRIVE channel. An LED indicates when active.
9. MORPHING CONTROL: Crossfades between various distortion characteristics.
10. PRESENCE CONTROL: Adjusts high midrange frequencies in the OVERDRIVE channel.
11. VOLUME CONTROL: Adjusts the volume of the OVERDRIVE channel. Use both VOLUME controls to balance channel volumes for seamless switching.
12. OVERDRIVE BASS: Adjusts bass frequencies in the OVERDRIVE channel EQ.
13. OVERDRIVE MID: Adjusts midrange frequencies in the OVERDRIVE channel EQ.
14. OVERDRIVE TREBLE: Adjusts upper frequency range in the OVERDRIVE channel EQ. Note: With all OVERDRIVE EQ controls set to minimum, no signal may be sent to the speaker.
15. PARAMETER CONTROL: Edits effect-specific parameters. The selected parameter's value is displayed.
16. STATUS LEDs: Indicate the type of parameter being edited (TIME, SPEED, SENS, PITCH, EQ). The MIDI LED indicates MIDI channel setup and data reception. The built-in effects module has 31 effect groups and 99 variations.
17. DISPLAY: Shows the preset number or parameter value.
18. ENTER BUTTON: Confirms program selection or preset saving.

Note on MIDI: When MIDI functions are inactive, one effect can be stored per channel. When MIDI is active, this assignment is disabled, allowing separate channel and effect selection.

Preset Saving: The decimal point in the display flashes when editing. Press and hold ENTER to save changes. To restore factory presets, hold ENTER while powering on.

19. DOWN BUTTON: Decrements the program number.

20. UP BUTTON: Increments the program number. Hold to scroll through programs.

21. EFFECT A CONTROL: Determines the mix of original and effect signals (left channel/first effect). Can also edit a second, effect-specific parameter.

22. EFFECTS BUTTON: Activates or deactivates the selected effect.

23. EFFECT B CONTROL: Determines the mix of original and effect signals (right channel/second effect). Can also edit a third, effect-specific parameter.

24. AUX IN CONTROL: Adjusts the volume of the AUX signal input.

25. POWER LED: Indicates when the unit is powered on.

26. MASTER CONTROL: Adjusts the overall volume level of the ULTRATWIN.

27. POWER SWITCH: Turns the ULTRATWIN on or off.

1.3.2 Rear Panel

The rear panel provides various input and output connectors:

28. FUSE HOLDER/VOLTAGE SELECTOR: Ensure correct voltage setting. Blown fuses must be replaced with the same type and rating. Some models allow voltage switching by rotating the fuse holder.
29. POWER CORD CONNECTION: Connect the unit to the mains using the supplied power cord.
30. MIDI IN: Standard 5-pin DIN connector for MIDI remote control (program changes, controller information).
31. SERIAL NUMBER: For warranty registration.
32. EXT. LEFT/RIGHT CONNECTORS: 1/4" jacks for external loudspeakers (minimum 4Ω, 8Ω recommended for maximum power).
33. INTERNAL OFF SWITCH: Mutes internal speakers, useful for headphone monitoring or when using external speakers.
34. HEADPHONES JACK: 1/4" stereo jack for monitoring with headphones. Output is frequency-corrected (Speaker Emulation).
35. SLAVE IN JACKS: For routing an external signal to the ULTRATWIN's power stage or for inserting external stereo effects devices.
36. TAPE OUT: RCA jacks, providing the same signal as LINE OUT.
37. TAPE IN: RCA jacks, same as AUX IN.
38. LINE OUT: Stereo output for recording or live applications, frequency-corrected (Speaker Emulation).
39. AUX IN: For additional stereo signals (e.g., drum computer, playback). Can be used for parallel effects.
40. INSERT SEND: For serial effects (e.g., wah-wah pedal).
41. INSERT RETURN: Connects to the output of an external effects device for serial effects.
42. FOOTSWITCH JACK: Connects the included FS112 footswitch for channel changes or effect bypass.

Wiring Examples

2.1 Standard Setup

For rehearsals or stage use, connect your guitar, footswitch, and external effects device as shown in the diagram. The ULTRATWIN's internal effects can be used without the insert path. Connecting headphones mutes the built-in speaker.

Diagram Description: A guitar connects to the ULTRATWIN's input. An optional external effects device connects via the INSERT SEND and INSERT RETURN jacks. A footswitch connects to the FOOTSWITCH jack. Headphones can be connected to the HEADPHONES jack.

2.2 Expanded Setup

For advanced applications, connect a MIDI foot controller, playback source, and mixing console. Use the MIDI foot controller to manage presets, channels, and effects. The line out can feed a PA or recording console, and the AUX input can be used for playback sources.

Diagram Description: A mixer receives input from the ULTRATWIN's LINE OUT. A tape deck connects to the ULTRATWIN's TAPE IN and OUT. A MIDI Foot Controller connects to the ULTRATWIN's MIDI IN. The ULTRATWIN's guitar input and footswitch connection are also shown.

2.3 Master/Slave Setup

2.3.1 ULTRATWIN GX212 as Master: Use the SLAVE IN jacks to amplify the ULTRATWIN's signal with an external power amp. Connect the ULTRATWIN's SLAVE IN jacks to the external power amp's input jacks using appropriate cables.

Diagram Description: An external power amp's LINE IN is connected to the ULTRATWIN GX212's SLAVE IN jacks. The connection shows the TIP and RING bridged on the stereo plug.

2.3.2 ULTRATWIN GX212 as Slave: Drive the ULTRATWIN's power stage from an external amplifier or preamp. Connect the external amp's line outputs to the GX212's SLAVE IN jacks. If using a mono preamp, split the signal to both SLAVE IN inputs.

Effects Processor

The ULTRATWIN features a built-in effects processor offering the same audio quality and algorithms as BEHRINGER's VIRTUALIZER PRO and MODULIZER PRO devices. It provides 31 effect groups with 99 presets, editable via three parameters each. Effects include reverb, chorus, flanger, delay, pitch shifter, compressor, expander, wah-wah, and speaker/tube emulation.

Preset Selection and Editing: Use the UP and DOWN buttons to select presets. Press ENTER to activate. Edit presets using PARAMETER, EFFECT A, and EFFECT B controls. The display shows parameter values. Save edited presets by holding ENTER for two seconds. Restore factory presets by holding ENTER during power-on.

EFFECT A/B Controls: These controls typically manage the mix of original and effect signals, often controlling left/right channels or primary/secondary effects.

3.1 Description of Effects

01-02 Spring Reverb: Emulates the sound of a spring reverb, common in guitar amps.
03-04 Studio: Simulates medium-sized rooms for versatile use.
05-06 Chamber: Replicates room sound with early reflections, suitable for diffuse reverb or adding naturalness to dry guitar.
07-08 Stage: A reverb effect to liven up and widen clean guitar sounds.
09-10 Concert: Offers reverb simulating a small theater (short pre-delay) or a large concert hall (long pre-delay), providing a livelier sound with more treble.
11-12 Plate: Emulates an ancient plate reverb for a rich, enchanting sound.
13-14 Gated Reverb: An effect that cuts off abruptly, famous for its use in "In the air tonight". EFFECT A controls sensitivity, EFFECT B controls the mix.
15-16 Ambience: Simulates early reflections and reverb tails to create subtle reverb densities without clouding the signal. PARAMETER adjusts room size, EFFECT A adjusts pre-delay, and EFFECT B controls the mix.
17-19 Wah/Delay/Distortion: Combines filters, wah effect, delay, and distortion. PARAMETER adjusts delay time, EFFECT A controls distortion intensity, and EFFECT B manages delay mix. MIDI controller #15 can adjust the wah effect range.
20 Delay/Reverb: A delay effect with adjustable time and a reverb mix.
21-29 Delay: Provides stereo and mono delay effects with adjustable time, feedback (repeats), and mix.
30-33 Phaser: A modulation effect creating phase shifts across frequency ranges, controlled by an LFO.
34-37 Chorus: Emulates slightly detuned signal portions overlapping in time, creating a rich, widening effect.
38-42 Chorus/Reverb: Combines chorus with varying intensities followed by a reverb effect.
43-47 Chorus/Delay: Chorus effect followed by a delay effect with adjustable time and feedback.
48-51 Flanger: An LFO modulates pitch for a swirling effect, suitable for distorted guitar sounds.
52-56 Flanger/Reverb: Combines flanger with varying intensities followed by a reverb effect.
57-61 Flanger/Delay: Flanger effect followed by a delay effect with adjustable delay time.
62-63 Stereo Tremolo: Amplitude variation modulated by an LFO, combined with a panorama effect.
64-66 Tremolo/Delay: Amplitude modulation with delay effect.
67-68 Rotary Speaker: Simulates the sound of rotating organ speakers (Doppler effect). PARAMETER controls horn/rotor speed, EFFECT A adjusts sound character, and EFFECT B controls the mix.
69-70 Magic Drive: An effect combining delay with an LFO-controlled notch filter.
71-72 Auto Wah: A velocity-sensitive effect that adjusts cutoff frequency based on playing dynamics.
73-74 LFO Wah: Uses an LFO to modulate frequency for rhythmic wah effects.
75-81 Pitch Shifter: Shifts pitch to create musical intervals, harmonies, or widening effects. Heavy detuning can create a "Mickey-Mouse" sound.
82-85 Pitch/Reverb: Combines pitch shifting with stereo reverb.
86-89 Pitch/Delay: Combines pitch shifting with a delay effect.
90-91 Compressor: Limits dynamic range, provides sustain, or enhances attack sounds.
92-93 Expander: Expands dynamic range and reduces background noise.
94-96 Guitar Combo: Simulates the sound characteristics of a complete guitar amplifier, including tube stages, cabinet, and speaker.
97-99 Speaker Cabinet: Emulates different speaker cabinet types and resonance characteristics.

3.2 Controlling the ULTRATWIN via MIDI

The ULTRATWIN GX212 integrates into any MIDI setup, allowing control via program change and MIDI controller information. Connect the ULTRATWIN's MIDI IN to a MIDI controller's MIDI OUT. Enable MIDI functions by pressing UP and DOWN for two seconds, then select a MIDI channel (1-16, Omni, or Omni + decimal for Store Enable mode).

When MIDI functions are active, automatic effect-to-channel assignment is disabled. Presets can be selected via MIDI program change messages (0-127 corresponds to presets 1-128).

Real-time control of PARAMETER, EFFECT A, and EFFECT B is possible using MIDI controllers 12, 13, and 14 respectively. Channel changes can be made with controller #10 (0=CLEAN, 1=OVERDRIVE), or via program changes #123/124. Effects can be disabled with controller #11 (0=OFF, 1=ON) or program change #127.

MIDI controller #7 adjusts input sensitivity (volume controller). MIDI controller #15 controls the wah effect range.

Additional MIDI control options include deactivating the LFO with controller #15 and controlling the ULTRATWIN via computer-based sequencer software.

3.2.1 Store Enable Mode

This mode allows direct storage of parameter changes from a MIDI sequencer. Activate by pressing UP and DOWN for two seconds, select a channel, and confirm with ENTER. Sending MIDI controller #18 while in this mode stores parameter changes.

4. Historical Background

This section features an essay by Neville Marten (Guitarist Magazine) discussing the evolution of guitar amplifiers from the 1940s to the present day. It highlights the contributions of pioneering brands like Fender, Ampeg, Gibson, Vox, Marshall, and Mesa Boogie, and the development of multi-channel designs and digital effects.

Installation

5.1 Mains Connection

Ensure the ULTRATWIN is set to the correct supply voltage before connecting. The voltage setting is indicated by triangular markings on the fuse holder. The unit connects via a standard IEC receptacle and enclosed mains cable. Always ensure a proper ground connection.

5.2 Audio Connections

The ULTRATWIN uses unbalanced 1/4" jacks for audio connections. The headphones output is a stereo 1/4" jack. Installation and operation should be performed by qualified persons with sufficient electrical contact to earth.

Diagram Description: A mono 1/4" plug wiring shows Tip (Signal) and Sleeve (Ground/Shield). A stereo 1/4" plug wiring shows Tip (Left Signal), Ring (Right Signal), and Sleeve (Ground/Shield).

5.2.1 Loudspeaker Connection

Two speaker jacks are available for connecting supplementary speakers. 8Ω loudspeakers are recommended for optimal adaptation. Use the INTERNAL OFF switch to activate external speakers. Connecting speakers with less than 4Ω impedance may trigger protective circuitry. Power output decreases proportionally with increased impedance.

5.3 MIDI Connection

The ULTRATWIN utilizes a standard 5-pin DIN jack for MIDI communication. MIDI cables should not exceed 15 meters. Ensure correct pin connections (pin 4 to 4, pin 5 to 5). The MIDI IN connector receives controller information, with the receiving channel configurable via UP/DOWN buttons (On = Omni mode).

Appendix

6.1 Preset List

Table 6.1 provides detailed information on effect numbers, names, parameter types, ranges, and factory default settings for all presets.

6.2 MIDI Implementation

The MIDI Implementation Chart (Table 6.2) details the functions, transmitted/recognized messages, and remarks for MIDI communication. Table 6.3 lists MIDI control changes for parameters like Volume, Channel, Effect, Parameter, Effect A, Effect B, Wah/Modulation, and Store Enable.

Specifications

Audio Inputs: 1/4" mono jack (Guitar input, Insert return, Aux input, Slave input), RCA (Tape input). Impedances range from 1 kΩ to 1 MΩ.

Audio Outputs: 1/4" mono jack (Insert send, Line output), RCA (Tape output). Line output max level +12 dBu.

Loudspeaker Outputs: 1/4" mono jack, 8Ω load impedance nominal.

System Specifications: Power amplifier output is 2 x 60 Watts RMS into 8Ω.

MIDI Interface: 5-pin-DIN-socket, MIDI IN.

Digital Processing: 24-bit sigma-delta converters, 46.875 kHz sampling rate.

Display: 2-digit numeric LED-display.

Loudspeaker: 2 x 12" SHARK 12G100A, 8Ω impedance, 100 Watts power handling.

Power Supply: Various mains voltages supported (100-240V~, 50-60Hz). Power consumption approx. 30W min / 200W max. Fuse ratings provided.

Physical: Dimensions approx. 18.5" x 26.68" x 9.84". Weight approx. 21.0 kg.

Warranty

BEHRINGER offers a one (1) year warranty on mechanical and electronic components against defects in material and workmanship. To obtain warranty service, buyers must complete and return the warranty card or register online within 14 days of purchase. Shipments must include a return authorization number and be freight prepaid. Warranty does not cover normal wear and tear, improper handling, or unauthorized modifications. Statutory rights are not affected.

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