Sequential Oberheim OB-6 Six Voice Polyphonic Analog Synthesizer


A Synth Designed by Two Legends

What if two legendary synthesizer designers got together and built an analog polysynth using today’s state-of-the-art technology? If you’ve just pinched yourself to see if you’re dreaming, we can assure you: you’re not. The Sequential OB-6 is a 6-voice, all-analog, 49-key synth inspired by Tom Oberheim’s classic SEM circuits from the 1970s. Tom and Dave Smith packed the OB-6 with everything on your wish list. With two voltage-controlled oscillators and sub oscillator per voice, a state-variable filter, 64-step polyphonic step sequencer, twin digital effects engines, and more, the Sequential OB-6 delivers fat, punchy, in-your-face sonics that will power your music to new heights.

Sequential / Oberheim OB-6 at a Glance:

  • Synth dreams are made of this
  • Heart of the beast: Oberheim’s classic SEM
  • X-Mod, Poly Step Sequencer, and Arpeggiator

Synth dreams are made of thisNow, finally, the artillery you need. The Sequential OB-6 rocks six discrete analog voices with two oscillators and a sub oscillator per voice. Naturally, OB-6 is equipped with Dave’s infamous X-mod (two sources, five destinations). On top of all that, there’s a 64-step polyphonic step sequencer, two digital effects engines (with studio-grade reverbs, delays, chorus, flangers, and accurate re-creations of Mr. Oberheim’s renowned ring mod and phase shifter), and an advanced arpeggiator. To control all this firepower, you have a knob-per-function top panel and a silky-smooth, semi-weighted, velocity- and aftertouch-enabled keyboard. From funk-laden basses and snarling, in-your-face leads to gloriously celestial pads, the OB-6 will make your synth dreams come true.

Heart of the beast: Oberheim’s classic SEMOberheim’s original SEM (Synthesizer Expansion Module) formed the core of Tom’s renowned 4-Voice and 8-Voice synths of the 1970s. The SEM, in updated form, is also the core of the OB-6 analog sound engine. With two discrete voltage-controlled oscillators and a sub oscillator per voice, the OB-6 gives you the flexibility of waveshapes that are continuously variable between sawtooth and variable-width pulse. Oscillator 2 also sports a triangle wave. The classic Oberheim-style state-variable, 2-pole resonant filter features lowpass, highpass, bandpass, and notch functionality. The all-analog signal path is completed by the OB-6’s voltage-controlled amplifiers.

X-Mod, Poly Step Sequencer, and ArpeggiatorThe OB-6 is spec’d out with Dave Smith’s brilliant X-Mod, which makes it easy to achieve killer sounds via modulation. The filter envelope and oscillator 2 are the sources, and they both give you bi-polar control. The five destinations are oscillator 1 frequency, oscillator 1 waveshape, oscillator 1 pulse-width, filter mode, and filter cutoff. The polyphonic step sequencer lets you program polyphonic sequences (up to 64 steps, up to six notes per step), complete with rests, and sync them to external MIDI clock. The full-function arpeggiator can also be synced to external MIDI clock. You can configure the OB-6’s Unison Mode voice count for up to six voices; it also features a chord memory and key modes.

Sequential OB-6 Features:

  • 2 oscillators and sub oscillator per voice
  • Continuously variable waveshapes
  • State-variable filter
  • 64-step polyphonic step sequencer
  • Full-function arpeggiator
  • 2 digital effects engines
  • Knob-per-function top panel
  • 49-note semi-weighted, velocity- and aftertouch-enabled keybed

Dave Smith Instruments OB-6: this analog polysynth has it all!

Tech Specs

  • Type:Keyboard Synthesizer
  • Analog/Digital:Analog
  • Number of Keys:49
  • Type of Keys:Semi-weighted with velocity, aftertouch
  • Other Controllers:Pitchbend, mod wheel
  • Polyphony:6
  • Number of Presets:500 user, 500 factory programs
  • Effects Types:Analog distortion, reverbs, delay, chorus, flanger, phase, ring modulator
  • Sequencer:Polyphonic 64-step sequencer
  • Audio Outputs:2 x 1/4″ (left, right)
  • Headphones:1 x 1/4″
  • USB:1 x USB Type B
  • MIDI I/O:In/Out/Thru/USB
  • Pedal Inputs:1 x volume expression, 1 x sustain, 1 x sequencer start/stop, 1 x filter cutoff expressoin
  • Height:4.6″
  • Width:31.8″
  • Depth:12.7″
  • Weight:20.9 lbs.
  • Manufacturer Part Number:DSI-2700


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