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Dave Smith Instruments OB-6 Analog Synthesizer

6-voice polyphonic analog synthesizer developed in collaboration with Tom Oberheim

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  • Product Description

    The Dave Smith Instruments OB-6 is the result of a collaboration between Dave Smith and Tom Oberheim. 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. No other modern analog poly synth can boast such a pedigree or such a massive, in-your-face sonic signature.

    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.

    X-Mod and Poly Step Sequencing

    Also present is X-Mod, which expands the tonal palette and makes it easy to create dramatic and unconventional sounds. Modulation sources are filter envelope and oscillator 2, both with bi-polar control. Destinations include oscillator 1 frequency, oscillator 1 shape, oscillator 1 pulse width, filter cutoff, and filter mode. The polyphonic step sequencer allows up to 64 steps and up to 6 notes per step. You can create sequences polyphonically, with rests, and sync to an external MIDI clock. The full-featured arpeggiator can be synced to external MIDI clock as well. Unison mode features configurable voice count (1-6 voices), chord memory, and key modes.

    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.

    Easy to Play

    This analog powerhouse is packed into a four-octave, semi-weighted keyboard with velocity and channel aftertouch, making it perfect for stage or studio.

    Oscillators

    • Two discrete VCOs per voice
    • Continuously variable wave shape (sawtooth and variable-width pulse, plus triangle on oscillator 2) per oscillator
    • Pulse width per oscillator
    • Hard sync: oscillator 1 syncs to oscillator 2
    • Square wave sub-octave generator (oscillator 1) per voice
    • Low frequency mode (oscillator 2)
    • Keyboard tracking on/off (oscillator 2)
    • Oscillator detune amount 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

    Filter Envelope

    • Four-stage (ADSR) envelope generator
    • Velocity modulation of envelope amount

    Amplifier Envelope

    • Four-stage (ADSR) envelope generator
    • Velocity modulation of envelope amount

    Low Frequency Oscillator

    • Five wave shapes: triangle, 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

    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

    Aftertouch

    • Source: channel (mono) aftertouch with bi-polar amount
    • Destinations: oscillator 1 frequency, oscillator 2 frequency, LFO amount, amplifier envelope amount, filter envelope amount

    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
    • One, two, or three octave range
    • Up, down, up/down, random, and assign modes

    Sequencer

    • Polyphonic step sequencer with up to 64 steps and rests

    Effects

    • Stereo analog distortion
    • Dual, 24-bit, 48 kHz digital effects, including: reverb (room, hall, plate, spring), delay (full bandwidth digital delay and emulated bucket brigade and tape delays), chorus, flanger, phase shifters, and ring modulator
    • Delay sync
    • True bypass maintains fully analog signal path when digital effects are off

    Performance Controls

    • Full-sized, semi-weighted, 4-octave keyboard with velocity and aftertouch
    • Backlit pitch and mod wheels
    • Spring-loaded pitch wheel with selectable range per program (1 to 12 semitones up and down)
    • Transpose controls for an 8-octave range
    • Hold switch latches held notes on
    • Polyphonic portamento
    • Unison (monophonic) mode with configurable voice count, from one to all six voices, chord memory, and key modes
    • Manual switch: when off, the front panel is live; what you see is what you hear


    Patch Memory

    • 500 user and 500 factory programs in 10 banks of 100 programs each
    • Direct program access, including single-button access to the current set of 10 programs

    In/Out

    • Left/mono and right audio outputs (2 x 1/4” phone jack)
    • Headphone output (stereo, 1/4” phone jack)
    • MIDI in, out, and thru ports
    • USB for bidirectional MIDI communication
    • Filter cutoff expression pedal input
    • Volume expression pedal input
    • Sustain footswitch input
    • Sequencer start/stop footswitch input

    Power

    • IEC AC power inlet for internal power supply
    • Operates worldwide on voltages between 100 and 240 volts at 50 to 60 Hz; 30 watts maximum power consumption

  • Additional Information

    Condition New
    Output Connectors 1/4 in. TRS
    MIDI Connections In, Out, Through
    Number of Keys 49
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