Sequential OB-6 6-Voice Polyphonic Analog Synthesizer

Sequential OB-6 6-Voice Polyphonic Analog Synthesizer

Sequential OB-6 6-Voice Polyphonic Analog Synthesizer

B&H # SEDSI2700 MFR # DSI-2700
Sequential OB-6 6-Voice Polyphonic Analog Synthesizer

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Product Highlights

  • Semi-Weighted Velocity-Sensitive Keys
  • 4-Octave Keyboard w/ Channel Aftertouch
  • 6 Voices w/ 2 Oscillators per Voice
  • 2-Pole State-Variable Resonant Filter
  • Dual 24-Bit/48 kHz FX Engine
  • X-Mod Modulation Matrix
  • Polyphonic Arpeggiator
  • Polyphonic Step Sequencer w/ 64 Steps
  • 1- to 6-Voice Unison Mode
  • 1000-Program Patch Memory
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Sequential DSI-2700 overview

  • 1Description

The OB-6 from Dave Smith Instruments is a modern, all-analog 6-voice polyphonic synthesizer that pays tribute to Tom Oberheim's SEM 4-voice and 8-voice synthesizers, but with several enhancements. The synth features true voltage-controlled oscillators, a classic Oberheim-inspired 2-pole, state-variable resonant filter, amplifiers, envelopes, and an LFO. Additional enhancements include studio-quality effects, a polyphonic step-sequencer, and an arpeggiator; all of which can be synchronized internally or via external MIDI clock.

The four-octave, semi-weighted keyboard offers velocity sensitivity and channel aftertouch, while the control panel offers knob-per-function control with no menu diving. There are 500 permanent factory programs and 500 user programs which are organized into 10 banks of 100 presets. The OB-6 offers an ideal combination of portability and power for the project studio or the gigging musician.

Two Legends. One Instrument
  • The OB-6 is a collaboration between Dave Smith and Tom Oberheim, two of the most influential designers in poly synth history. The OB-6 takes the classic bold Tom Oberheim sound, with its true voltage-controlled oscillators, 2-pole filter, and amplifiers, and adds modern enhancements such as studio-quality effects, a polyphonic step sequencer, an arpeggiator, and more
Vintage SEM Tone
  • Sound engine inspired by Tom Oberheim's original SEM synthesizers
  • Two discrete voltage-controlled oscillators (plus sub-oscillator) per voice
  • Continuously Variable Waveshapes: Sawtooth and variable-width pulse, plus a triangle wave on oscillator 2
  • Classic Oberheim-inspired 2-pole, state-variable, resonant filter with low-pass, high-pass, band-pass, and notch functionality
  • VCA: Voltage-controlled amplifiers
Dual Effects
  • Dual Effect Engine: 24-bit/48 kHz resolution
  • Studio-quality reverbs, delays (standard and BBD), chorus, and phase shifter
  • True bypass maintains a full analog signal path
  • Independent stereo 100% analog distortion effect
X-Mod and Poly Step Sequencing
  • Modulation Sources: Filter envelope and oscillator 2 (both with bi-polar control)
  • Destinations: Oscillator 1 frequency, oscillator 1 shape, oscillator 1 pulse width, filter cutoff, and filter mode
  • Unison Mode: Configurable voice count (1-6 voices) and key modes
  • Polyphonic Step Sequencer: 64 steps with up to 6 notes per step with rests. Syncs to an external MIDI clock
  • Arpeggiator: Syncs to external MIDI clock
Easy to Program
  • Knob-per-function front panel offers instant access to virtually all OB-6 functions
  • 1000 Presets: 500 permanent factory programs and 500 user programs organized into 10 banks of 100 programs
  • Live Panel Mode: Switches from a preset to current knob and switch settings
Easy to Play
  • Four-octave, semi-weighted keyboard with velocity and channel aftertouch
  • Programmable Backlit Pitch Wheel: 1 to 12 semitones
  • Backlit modulation wheel
UPC: 855346000753
In the Box
Sequential OB-6 6-Voice Polyphonic Analog Synthesizer
  • IEC Power Cord
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Sequential DSI-2700 specs

    Oscillators 2x discrete VCOs per voice
    Wave Shape per Oscillator (Continuously Variable): Sawtooth and variable-width pulse, plus triangle on oscillator 2
    Pulse width per oscillator
    Hard Sync: Oscillator 1 syncs to oscillator 2
    Square Sub-Octave Generator: Oscillator 1 per voice
    Low-Frequency Mode: Oscillator 2
    Keyboard Tracking: On/off (oscillator 2)
    Oscillator Detune: For increased tuning instability, from subtle to extreme
    Mixer Oscillator 1 amount
    Oscillator 1 sub-octave amount
    Oscillator 2 amount
    White noise amount
    State-Variable Filter Two-pole, resonant, filter per voice with low-pass, high-pass, band-pass, and notch functionality inspired by the original Oberheim SEM filter
    Bi-polar filter envelope amount
    Velocity modulation of envelope amount
    Keyboard tracking: off, half, full
    Envelope Generators Filter Envelope: Four-stage (ADSR) envelope generator with velocity modulation of envelope amount
    Amplifier Envelope: Four-stage (ADSR) envelope generator with velocity modulation of envelope amount
    LFO 5x Wave Shapes: Sine, sawtooth, reverse sawtooth, square, and random (sample and hold)
    Clock sync (internal or external MIDI clock)
    Initial amount
    Mod Destinations: Oscillator 1 frequency, oscillator 2 frequency, oscillator 1 and 2 pulse width, filter cutoff, filter mode, amp
    X-Mod Sources: Filter envelope (bi-polar) and oscillator 2 (bi-polar)
    Destinations: Oscillator 1 frequency, oscillator 1 shape, oscillator 1 pulse width, filter cutoff, filter mode, normal to bandpass filter
    Aftertouch Source: Channel (mono) aftertouch with bi-polar amount
    Destinations: Oscillator 1 frequency, oscillator 2 frequency, LFO amount, amplifier envelope amount, filter envelope amount, filter mode
    Clock Master clock with tap tempo
    BPM control and display
    MIDI clock sync
    Arpeggiator Selectable Note Value: 16th note, 8th note triplet, 8th note, dotted 8th note, quarter note
    1, 2, or 3 octave range
    Up, down, up/down, random, and assign modes
    Sequencer Polyphonic Step Sequencer: 64 steps and rests
    Effects Stereo analog distortion
    Dual, 24-bit, 48 kHz Digital Effects: Reverb (room, hall, plate, spring), delay (full bandwidth digital delay and emulated bucket brigade and tape delays), chorus, and phase shifter
    Delay sync
    True Bypass: Maintains fully analog signal path when digital effects are off
    Controls Keyboard: Full-sized, semi-weighted, 4-octave with velocity and aftertouch
    Pich Wheel: Backlit, spring-loaded with selectable range per program (1 to 12 semitones up and down)
    Mod Wheel: Backlit
    Transpose: 8-octave range
    Hold Switch: latches held notes on
    Polyphonic Glide: Portamento
    Unison (Monophonic) Mode: Configurable voice count, from one to all six voices, chord memory, and key modes
    Manual switch: when on, the front panel is live; what you see is what you hear
    Patch Memory 1000 Programs: 500 user / 500 factory programs in 10 banks of 100 programs each
    Direct program access, including single-button access to the current set of 10 programs
    Input & Output Left/Mono & Right Audio Outputs: 2 x 1/4" / 6.35 mm phone jack
    Headphone Output: Stereo, 1/4" / 6.35 mm phone jack
    MIDI: In, out, and thru ports
    USB: Bi-directional MIDI communication
    Filter cutoff expression-pedal input
    Volume expression-pedal input
    Sustain footswitch input
    Sequencer start/stop footswitch input
    Power 100/240 volts at 50/60 Hz
    Power Consumption: 30 W maximum
    IEC AC power inlet for internal power supply
    Dimensions (L x W x H) 32.0 x 12.7 x 4.6" / 81.3 x 32.3 x 11.7 cm
    Weight 20.0 lb / 9.1 kg
    Packaging Info
    Package Weight 31.5 lb
    Box Dimensions (LxWxH) 37.9 x 19.0 x 9.3"

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