Image: Alison Cassidy, CC BY-SA 4.0 — via Wikimedia Commons
Oberheim OB-Xa
| Category | Electronic (analog polyphonic synthesizer) |
|---|---|
| Country of origin | USA |
| Classification | analog synthesizer |
| Wikipedia | en.wikipedia.org |
| Wikidata | Q956076 |
Overview
The Oberheim OB-Xa is a polyphonic analog synthesizer released in 1980. It offers up to eight voices of analog synthesis, with two oscillators per voice, a switchable lowpass filter, and a programmable patch memory. It is best known for thick, brassy timbres and lush pad sounds that became a hallmark of early-1980s pop production.
Origin & History
The OB-Xa followed the earlier OB-X and was Oberheim’s response to the success of polyphonic competitors such as the Sequential Circuits Prophet-5. It introduced curtis-chip-based filters and several refinements that improved tuning stability and cost. The model gave way in turn to the OB-8 in 1983. Original OB-Xa units have become highly sought after on the vintage synthesizer market.
How It’s Played
The OB-Xa is played from its built-in keyboard or via external control. Each voice combines two oscillators detunable from one another, a noise source, an envelope generator, and a low-frequency oscillator. Patches can be saved to memory, an important feature in the late 1970s and early 1980s when many comparable instruments still required manual patch resetting. Velocity is not detected, but split and double modes allow performance flexibility on stage.
Cultural Significance
The OB-Xa became one of the defining sounds of early-1980s rock and pop. Van Halen’s “Jump,” Prince’s “1999,” and many other widely-heard recordings of the period feature its characteristic thick brass and lead sounds. In film and television scoring it was widely used for orchestral-style pads. Today the instrument’s voicing is reproduced in software emulations and in modern Oberheim-branded reissues.
Related Instruments
- Sequential Circuits Prophet-5 – the leading rival of the era
- Roland Juno-106 – a classic 1980s polysynth contemporary
- Yamaha CS-80 – a contrasting analog flagship
- PPG Wave – a wavetable contemporary
- Korg Wavestation – a digital evolution of polyphonic design
Frequently Asked Questions
How many voices does the Oberheim OB-Xa have?
Up to eight voices, in models that include the full voice complement.
Is the OB-Xa a true analog synthesizer?
Yes. The signal path is fully analog, with digital control over patch memory and modulation routing.
Which famous tracks use the OB-Xa?
Notable examples include Van Halen’s “Jump” and Prince’s “1999,” both of which feature its characteristic tone.
Image: photograph by Alison Cassidy, CC BY-SA 4.0 (Wikimedia Commons).
