Exploring the Behringer UB-Xa: Features, Sound Quality, and Performance

Recreating the Magic of a Classic Analog Legend

Behringer has made a name for itself by reviving classic synthesizers with modern twists, and the UB-Xa is no exception. Modeled after the legendary Oberheim OB-Xa, this synthesizer aims to bring the lush, iconic sounds of the original to a new generation of musicians. The UB-Xa is a tribute to one of the most celebrated analog polyphonic synthesizers of the early ’80s, offering a faithful recreation with some modern enhancements.

Overview:

The Behringer UB-Xa is an analog polyphonic synthesizer that captures the essence of the original Oberheim OB-Xa, known for its rich, warm sound and powerful presence in both studio and live environments. With 8-voice polyphony, dual analog oscillators per voice, and classic Oberheim-style filters, the UB-Xa is designed to deliver the same expansive, lush tones that made the OB-Xa a favorite among synth enthusiasts. While staying true to the original design, Behringer has also included some modern features, making it a versatile instrument for contemporary use.

Sound Engine:

The UB-Xa’s sound engine is entirely analog, faithfully reproducing the architecture of the original OB-Xa. The synthesizer features two VCOs (voltage-controlled oscillators) per voice, which are responsible for generating the rich, analog waveforms that the OB-Xa was famous for. The UB-Xa also includes the same 12dB/octave and 24dB/octave filter options, allowing users to switch between the characteristic OB-Xa filter and a steeper, more aggressive filter response. The sound engine’s accuracy and depth ensure that the UB-Xa can deliver everything from soaring leads to deep, immersive pads.

Oscillators and Waveforms:

The UB-Xa comes with two analog oscillators per voice, offering a variety of classic waveforms such as sawtooth, pulse, and square. These oscillators can be synced for more complex harmonic content, and pulse-width modulation is available for additional tonal shaping. The instrument’s ability to blend waveforms from both oscillators allows for a broad palette of sounds, from thick, detuned basses to shimmering highs. While it stays true to the analog roots, the UB-Xa also allows users to dive deep into waveform editing for more personalized sound creation.

Filters and Modulation:

The filter section is a key component of the Behringer UB-Xa, offering the classic 2-pole (12dB/octave) and 4-pole (24dB/octave) filter designs found in the original OB-Xa. These filters are essential for shaping the sound, allowing for everything from smooth, creamy lows to sharp, resonant highs. Modulation options are extensive, with two envelope generators and an LFO (low-frequency oscillator) providing plenty of possibilities for dynamic sound shaping. The modulation matrix is straightforward yet flexible, enabling users to create anything from subtle tonal variations to wild, evolving soundscapes.

Effects Processing:

While the original OB-Xa was known for its raw analog sound, the UB-Xa integrates some modern effects processing to expand its sonic capabilities. Behringer has included high-quality digital effects such as reverb and delay, which can be used to add depth and dimension to the analog sounds. These effects are designed to complement the UB-Xa’s vintage character without overshadowing its rich analog tones.

Polyphony and Voice Modes:

The UB-Xa offers 8-voice polyphony, which is ideal for creating lush, multi-layered sounds. Each voice consists of two oscillators, which can be stacked or split to create powerful unison sounds or complex, layered patches. The synthesizer also features several voice modes, including monophonic, polyphonic, and unison modes, providing flexibility for both live performance and studio production. The ability to detune each oscillator in unison mode adds even more thickness to the sound, reminiscent of classic analog stacks.

Keyboard and Controls:

The UB-Xa is equipped with a full-sized, 61-key keyboard that is both velocity-sensitive and expressive. The control interface is designed to be as intuitive as the original, with a familiar layout that includes dedicated knobs and sliders for all the key parameters. This hands-on approach allows users to quickly shape their sounds without diving into menus. The tactile controls are responsive and well-built, making the UB-Xa a pleasure to play and program.

Sequencing and Arpeggiation:

The UB-Xa includes a built-in arpeggiator and step sequencer, providing additional creative tools for live performance and composition. The arpeggiator offers multiple modes and patterns, while the step sequencer allows for the creation of complex rhythmic sequences. These features enhance the UB-Xa’s versatility, making it not just a powerful synth for sound design but also a creative tool for generating musical ideas.

Build Quality and Durability:

Behringer has built the UB-Xa with a focus on durability, using high-quality components and solid construction. The chassis is robust, with a metal case that can withstand the rigors of live performance. The knobs and sliders are sturdy and reliable, designed for heavy use. Overall, the UB-Xa is a well-built instrument that should stand up to the demands of both stage and studio.

Connectivity and Power Base:

The Behringer UB-Xa is equipped with a variety of connectivity options, including MIDI In/Out/Thru, USB-MIDI, and CV/Gate outputs, making it easy to integrate into any studio or live setup. The inclusion of both traditional and USB MIDI allows for seamless connection to modern DAWs and other MIDI controllers. Additionally, the UB-Xa features stereo outputs, allowing for rich, full sound when connected to an external sound system. The power supply is internal, making the UB-Xa convenient for both studio use and live gigs.

Pros:

• Faithful recreation of the iconic Oberheim OB-Xa sound.
• Robust analog sound engine with dual VCOs per voice.
• Intuitive interface with hands-on controls.
• High-quality build with durable construction.
• Modern enhancements, including effects and MIDI connectivity.

Cons:

• Limited to 8 voices, which may be restrictive for complex layering.
• Learning curve for those unfamiliar with analog synthesis.

Conclusion:

The Behringer UB-Xa is a standout synthesizer that successfully revives the magic of the Oberheim OB-Xa while adding modern enhancements for today’s musicians. With its authentic analog sound engine, intuitive interface, and robust build quality, the UB-Xa is a worthy successor to the classic OB-Xa. Whether you’re a seasoned synthesist looking to recapture the sounds of the ’80s or a newcomer eager to explore the depths of analog synthesis, the UB-Xa offers a powerful and inspiring tool for sound creation.