imgi_2_1-1200x1200
imgi_21_2-1200x1200
imgi_22_4-1200x1200
DeWatermark.ai_1753800288812
DeWatermark.ai_1753800254374
imgi_2_1-1200x1200
imgi_21_2-1200x1200
imgi_22_4-1200x1200
DeWatermark.ai_1753800288812
DeWatermark.ai_1753800254374

Sequential OB-6 Keyboard 6 Voice Polyphonic Analogue Synthesiser

Brand:  Sequential
SKU: SM-3233

Product Highlights

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, Sweetwater 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.

₹455,205

In stock

Buy Now
Estimated delivery dates: Apr 18, 2026 - Apr 22, 2026

In stock

Category:
DeWatermark.ai_1753800288812

Vintage SEM Tone

The OB-6 sound engine is inspired by Tom’s original SEM, the core of his acclaimed 4-voice and 8-voice synthesizers. It features two discrete voltage-controlled oscillators (plus sub-oscillator) per voice with continuously variable waveshapes (sawtooth and variable-width pulse, plus a triangle wave on oscillator 2). The classic Oberheim-inspired 2-pole, state-variable, resonant filter provides low-pass, high-pass, band-pass, and notch functionality. Voltage-controlled amplifiers complete the all-analog signal path.

Dual Effects

The dual effects section provides studio-quality reverbs, delays (standard and BBD), chorus, flangers, and faithful recreations of Tom’s original phase shifter and ring modulator. While the effects themselves are digital, with 24-bit, 48 kHz resolution, a true bypass maintains a full analog signal path.

imgi_21_2-1200x1200
imgi_2_1-1200x1200

X-Mod and Poly Step Sequencing

The knob-per-function front panel puts virtually all OB-6 functions at your fingertips. Included are 500 permanent factory programs and 500 rewritable user programs. Turning on the Manual button enables live panel mode, in which the sound of the OB-6 switches to its current front panel settings. In this state, what you see is what you hear.

Easy to Program

The knob-per-function front panel puts virtually all OB-6 functions at your fingertips. Included are 500 permanent factory programs and 500 rewritable user programs. Turning on the Manual button enables live panel mode, in which the sound of the OB-6 switches to its current front panel settings. In this state, what you see is what you hear.

imgi_22_4-1200x1200

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

Tech Specs

  • Type:Keyboard Synthesizer with Sequencer
  • Analog/Digital:Analog
  • Number of Keys:49
  • Type of Keys:Semi-weighted
  • Aftertouch:Yes
  • Velocity Sensitive:Yes
  • Other Controllers:Pitchbend, mod wheel
  • Polyphony:6 Notes
  • 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
  • Mod Matrix:2 Sources, 6 Destinations
  • Height:4.6″
  • Width:31.8″
  • Depth:12.7″
  • Weight:20.9 lbs.