Oberheim OB-X8

The Oberheim OB-X8 is an 8-voice bi-timbral polyphonic analog synthesizer that faithfully recreates three of Oberheim's most legendary instruments — the OB-X, OB-Xa, and OB-8 — in a single modern keyboard. Designed with input from Tom Oberheim himself, the OB-X8 features a fully discrete analog signal path with genuine SEM-lineage VCOs, VCAs, and both the OB-X's 2-pole SEM filter and the OB-Xa/OB-8's CEM3320 filter. This is not a digital modeling synth — it is real analog circuitry built to modern reliability standards, and it delivers the massive, warm Oberheim sound that defined decades of music.

Dual Filter Architecture

The OB-X8's standout feature is its two independent filter types per voice. The discrete SEM-descended 2-pole filter from the original OB-X offers four modes: low-pass, band-pass, high-pass, and notch. Alongside it sits the CEM3320 Curtis filter from the OB-Xa and OB-8, switchable between 2-pole and 4-pole modes. You can select either filter or blend between them, giving you access to the entire spectrum of classic Oberheim tones from a single instrument. This dual-filter approach is something no vintage Oberheim could do.

Oscillators and Sound Design

Each of the eight voices contains two discrete SEM/OB-X-lineage VCOs with saw, square, triangle, and sine waveforms, plus variable levels per oscillator. You get cross-modulation, pulse width control, and hard sync for aggressive lead tones. The bi-timbral architecture lets you split the keyboard into two zones or layer two completely different patches, and with OS v2.0, the OB-X8 supports MPE (MIDI Polyphonic Expression) for per-note pitch bends, slides, and pressure sensitivity from compatible controllers.

Modern Features and Build

The keyboard uses a high-quality FATAR keybed with velocity sensitivity and aftertouch, a major upgrade over vintage Oberheim keyboards. Storage has been expanded to hold over 600 user presets. The classic Oberheim pitch and modulation levers are fully programmable with adjustable bend range and assignable to one or both oscillators. A poly chain feature lets you connect multiple OB-X8 units for up to 32-voice polyphony. The build quality is solid, with a metal chassis and wood end cheeks that honor the vintage aesthetic.

Who Is This For?

• Oberheim enthusiasts who want OB-X, OB-Xa, and OB-8 sounds in one reliable instrument
• Professional keyboardists who need a premium analog polysynth for stage and studio
• Sound designers who want deep analog synthesis with dual filters and MPE support
• Producers seeking the definitive vintage Oberheim sound without the maintenance risks of 40-year-old hardware

The OB-X8 is the best way to get authentic Oberheim sound today. It eliminates the tuning instability, maintenance headaches, and reliability concerns of vintage units while adding modern features like MPE, bi-timbral operation, and expanded storage. If you have ever wanted an OB-X, OB-Xa, or OB-8 but balked at the cost and risk of vintage hardware, the OB-X8 delivers all three in a single, tour-ready instrument.