(Open Box) Sequential - OB-6 6-Voice Polyphonic Analog Synthesizer
(Open Box) Sequential - OB-6 6-Voice Polyphonic Analog Synthesizer, 49 semi-weighted keys
Email me when the availability or price changes
6-Voice Polyphonic Analog Synthesizer
Sequential - OB-6
Two Legends. One Instrument.The OB-6 is an exclusive 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 the true voltage-controlled oscillators, 2-pole filter, and amplifiers, and adds modern features such as studio-quality effects, a polyphonic step sequencer, an arpeggiator, and more. No other modern analog poly synth can deliver such a unique and huge signature sound.
at a glance
• 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
• Polyphonic Arpeggiator
Classic Oberheim Tones
Voltage-ControlledThe OB-6 sound engine is influenced by Tom’s original SEM, the heart of his highly rated 4-voice and 8- voice synthesizers.
It features two distinct voltage-controlled oscillators including a sub-oscillator per voice with continuously variable waveshapes including sawtooth and variable-width pulse, plus a triangle wave on oscillator 2.
The vintage Oberheim-inspired 2-pole, state-variable, resonant filter provides low-pass, high-pass, band-pass, and notch functionality. Voltage-controlled amplifiers finish the all-analog signal path.
X-Mod & Poly Step Sequencing
Extended FunctionalityAlso built into the OB-6 is the X-Mod, which gives you a wider range of tonal possibilities, making it easy to create dramatic and unique sounds. Modulation sources are filter envelope and oscillator 2, both with bi-polar control. Features include oscillator 1 frequency, oscillator 1 shape, oscillator 1 pulse width, filter cutoff, and filter mode.
The polyphonic step sequencer offers 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 fully fledged arpeggiator can be synced to external MIDI clock too. The unison mode includes configurable voice count (1-6 voices), chord memory, and key modes.
Tom Oberheim & Dave Smith Introduce The OB-6
The Tech Spec
| Features | Specification | 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: 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 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), 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 on, 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 |
| Physical Specs | 31.8” L x 12.7” W x 4.6″ H (80.7 cm x 32.3 cm x 11.7 cm) 20 lbs (9.5 kg) Walnut end panels |
