Sequential OB-6 Keyboard Synthesizer

The Sequential OB-6 synthesizer merges the creative genius of Dave Smith and Tom Oberheim to create an analog polyphonic instrument that delivers vintage charm with modern innovation. Combining the unmistakable sound of Oberheim’s SEM synthesis with advanced sequencing and effects, the OB-6 redefines what an analog synthesizer can do. Whether you’re crafting bold stage performances or intricate studio productions, this synth offers a sonic palette that’s both vast and immediately captivating.

Two Legendary Minds, One Epic Synthesizer

The Sequential OB-6 is a true collaboration of design legends, channeling the iconic Oberheim sound into a powerful, feature-rich instrument. Its analog architecture is powered by discrete voltage-controlled oscillators, state-variable filters, and amplifiers, all inspired by the original Oberheim SEM. But the OB-6 doesn’t stop there—it introduces cutting-edge tools like polyphonic step sequencing, X-Mod modulation, and dual digital effects to deliver versatility that bridges classic and contemporary.

The front panel’s intuitive, knob-per-function layout provides immediate access to sound-shaping controls, empowering musicians to bring their creative visions to life effortlessly. Whether you’re chasing vintage tones or crafting entirely new sounds, the OB-6 delivers in spades.

Key Features

• Vintage SEM Sound Engine: Analog architecture inspired by Oberheim’s SEM synthesizers, featuring dual VCOs per voice and a state-variable filter.
• Dual Effects Section: High-quality effects like reverb, delay, chorus, flanger, and Oberheim’s original phase shifter and ring modulator.
• Advanced Modulation: X-Mod expands sonic possibilities with bi-polar control for dynamic and unconventional sound design.
• Polyphonic Step Sequencer: Create 64-step sequences with up to 6 notes per step, fully syncable to external MIDI clock.
• User-Friendly Interface: Knob-per-function layout with a live panel mode for hands-on control.
• Performance-Ready Design: Four-octave semi-weighted keyboard with velocity and aftertouch, ideal for live and studio use.

The Visionaries Behind the OB-6

Dave Smith and Tom Oberheim are towering figures in the world of synthesizers, each credited with groundbreaking contributions that shaped the music industry. Dave Smith, often called the "Father of MIDI," revolutionized music technology by co-developing the MIDI protocol, which became the universal standard for electronic instruments. As the founder of Sequential, Smith introduced the Prophet-5, the first programmable polyphonic synthesizer with patch memory, forever altering how musicians create and perform. His relentless innovation has left an indelible mark on synthesis, with instruments like the Prophet-6 and OB-6 showcasing his enduring legacy of combining analog warmth with cutting-edge design.

Tom Oberheim, a pioneer of analog synthesis, is celebrated for creating the Oberheim Electronics brand and introducing the SEM (Synthesizer Expander Module). This innovation laid the foundation for the legendary 4-Voice and 8-Voice synthesizers, known for their lush, complex sounds and state-variable filters. Oberheim's instruments were instrumental in shaping the sound of countless genres, from rock and jazz to electronic music. His meticulous craftsmanship and dedication to sonic purity have made his designs iconic. The OB-6 stands as a testament to Oberheim’s profound influence, merging his classic tone with modern functionality. Together, Smith and Oberheim have crafted an instrument that honors their shared history while inspiring a new generation of musicians.

Technical Specifications

Oscillators

• Dual voltage-controlled oscillators per voice with continuously variable waveshapes.
• Sub-octave generator and hard sync for rich harmonic content.

Filters

• State-variable 2-pole resonant filter with low-pass, high-pass, band-pass, and notch options.

Effects

• Dual 24-bit, 48 kHz digital effects with true bypass.
• Includes reverb, delay, chorus, flanger, phase shifter, and ring modulator.

Sequencer and Arpeggiator

• Polyphonic step sequencer: 64 steps, up to 6 notes per step.
• Arpeggiator with multiple modes and sync to MIDI clock.

Performance Features

• Semi-weighted 4-octave keyboard with velocity and aftertouch.
• Unison mode with configurable voice count and chord memory.
• Backlit pitch and modulation wheels for expressive control.

Connectivity

• Stereo audio outputs and headphone jack.
• MIDI in/out/thru and USB MIDI connectivity.
• Expression pedal inputs for filter cutoff and volume.

Physical and Power

• Dimensions: 31.8" x 12.7" x 4.6" (80.7 cm x 32.3 cm x 11.7 cm).
• Weight: 20 lbs (9.5 kg).
• Universal power supply (100-240 V).