Dave Smith Instruments
OB-6 6 Voice Polyphonic Analog Synthesizer

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Item: N13-5238

OB-6 6 Voice Polyphonic Analog Synthesizer
OB-6 6 Voice Polyphonic Analog Synthesizer OB-6 6 Voice Polyphonic Analog Synthesizer OB-6 6 Voice Polyphonic Analog Synthesizer OB-6 6 Voice Polyphonic Analog Synthesizer OB-6 6 Voice Polyphonic Analog Synthesizer

Dave Smith Instruments OB-6

The OB-6, created from a collaboration between Dave Smith and Tom Oberheim, is a six-voice, fully analog two oscillator-per-voice synthesizer. Both oscillators have variable wave shapes from Saws to Pulse, (with a triangle wave on oscillator two.) The oscillators are then fed thru the iconic Oberheim SEM filter, with high pass, low pass, notch and bandpass outputs. These are then feed into analog VCAs, providing an all analog signal path.

Modulation sources can be assigned to essentially any parameter with no menu diving. Each control has a dedicated knob on the front panel. Also included is a dual effects section, that gives studio-quality delays, reverbs, chorus, as well as faithful recreations of the classic Oberheim phase shifter and ring mod. All the effects are 24-Bit, 48kHz digital resolution with true bypass, keeping the analog signal path when not in use.

A multimode arpeggiator and 64-step polyphonic step sequencer (six notes per step) are also included to make the OB-6 an entire synthesizer workstation. When not all voices are used by the sequencer, one can perform on the remaining voices while the sequence continues.

The keyboard is semi-weighted, with four octaves. It has full-size keys for those used to playing pianos and electric keyboards.

OB-6 Synthesizer Features


  • 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


  • Oscillator 1 amount
  • Oscillator 1 sub-octave amount
  • Oscillator 2 amount
  • White noise amount


  • 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


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


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


  • 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


  • 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


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


  • Master clock with tap tempo
  • BPM control and display
  • MIDI clock sync


  • 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


  • Polyphonic step sequencer with up to 64 steps and rests


  • 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


  • 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


  • 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

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  • 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


  • 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


  • 32” L x 12.7” W x 4.6″ H (81.3 cm x 32.3 cm x 11.7 cm)
  • 20 lbs (9.5 kg)

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