TheOberheim OB-Xawas the second ofOberheim'sOB-seriespolyphonicanalogsubtractivesynthesizers,replacing theOB-Xwith updated features.[1][2]
| OB-Xa | |
|---|---|
 Oberheim OB-Xa analog polyphonic synthesizer | |
| Manufacturer | Oberheim |
| Dates | 1980 – 1982 |
| Price | US$4595–5595 |
| Technical specifications | |
| Polyphony | Monophonicor 2,4, 6 or 8 voices |
| Timbrality | Bi-timbral (keyboard split/layering) |
| Oscillator | 2 VCOs per voice |
| LFO | 1 |
| Synthesis type | AnalogSubtractive |
| Filter | Switchable 12dB/oct and 24dB/oct resonant low-pass |
| Attenuator | 2 x ADSR; one for VCF, one for VCA |
| Aftertouchexpression | No |
| Velocity expression | No |
| Storagememory | Yes, 32 or 120 patches |
| Effects | None |
| Input/output | |
| Keyboard | 61-key |
| Left-hand control | Pitch Modulation |
| External control | Oberheim system |
History
editThe OB-Xa was released in December 1980, replacing the OB-X after only a year on the market. The OB-Xa was the first Oberheim product adorned with blue horizontal pinstripes on black background that would become standard trade dress for future Oberheim products. While the OB-Xa offered the same polyphony as its predecessor (4, 6 and 8-voice models were offered), its keyboard could be split into two halves (each with its own voice) or to layer voices to create thicker sound (essentially making two notes sound for every key pressed). The OB-Xa also added the ability to switch between 2-pole 12dB and 4-pole 24dB filtering. It offered Filter Envelope modulation for oscillator 2 (which allows the pitch to be modulated by the envelope) in place of the OB-X's ability to cross modulate (frequency modulation of the first VCO with the second VCO).[3]
Instead of the discrete circuits for oscillators and filters utilized by the OB-X, the OB-Xa (and the Oberheim synths to follow) switched to Curtisintegrated circuits.This made the inside of the synth less cluttered, facilitating troubleshooting, and reducing the cost of manufacture. It was getting more difficult to service the OB-Xa due to the scarcity of Curtis chips; however, Curtis in June 2016,[4]Coolaudio[5][6]and Alfa[7]all started re-manufacturing some of these chips which has breathed new life into the longevity of the OB-Xa and many other synthesizers that use these chips.
Impact
editThe synth was used in the famousVan Halensong "Jump".[3]Many other 1980s and '90s artists have used the synth includingNew Order,[3]Carpenters,The Police,Queen,Rush,Rod Stewart,Prince,Miles Davis,Simple MindsandGary Numan.[8]
Hardware re-issues and recreations
editIn 2017,Behringerannounced it would replicate the CEM3340 VCO chips used in the OB-Xa synthesizer. The widow of chip creatorDoug Curtisreleased a statement clarifying that the replica was made without permission and that Curtis "would be deeply saddened by the attempt of others to trade on his name and to make unsubstantiated claims of equivalency to his original inventions".[9]In 2018, Uli Behringer announced that Behringer would be producing a clone of the OB-Xa known as the UB-Xa,[10]but a microprocessor shortage delayed the project.[11]The following year, however, Behringer announced that the UB-Xa was ready for manufacture, and announced a desktop version. The first UB-Xa units were delivered in December 2023.[12]
In May 2022, the Oberheim OB-X8, a new 8-voice analog synthesizer with the voice architecture and filters of three classic Oberheim models: the OB-X, OB-Xa, and OB-8, along with functionality and features not included on the original models, was announced. The new synthesizer is manufactured bySequentialin partnership withTom Oberheim.[13][14]
References
edit- ^Vail, Mark (1993).Vintage Synthesizers.San Francisco, California: Miller Freeman Books. p. 154.ISBN0-87930-275-5.
- ^"Blast from the past: Oberheim OB-Xa - MusicRadar".Musicradar.
- ^abc"The 10 Most Widely Influential Synths Ever".Soundfly.2016-05-25.Retrieved2021-05-25.
- ^"Home".Curtis Electromusic Specialties.Retrieved5 July2018.
- ^"V3340D Voltage Controlled Oscillator".Retrieved27 April2020.
- ^"V3320 Voltage Controlled Filter".Retrieved27 April2020.
- ^"Semiconductor production".Retrieved27 April2020.
- ^"The Oberheim synthesizer: a playlist".National Science and Media Museum blog.28 August 2020.Retrieved2021-05-25.
- ^"Curtis chip company speaks out against vintage synth cloning".FACT Magazine.2017-03-22.Retrieved2020-05-21.
- ^"Behringer UB-Xa Synthesizer - Gearspace".
- ^"Behringer: Chip shortages worsened by Ukraine factory shutdowns, but could be relieved by 2023".
- ^"Behringer's long awaited UB-Xa synth is finally ready for production".
- ^Rogerson, Ben (2022-05-10)."Superbooth 2022: Oberheim is back with the OB-X8, an analogue love letter to its '80s synths".MusicRadar.Retrieved2022-05-18.
- ^Willings, Sam (2022-05-11)."Superbooth 2022: Tom Oberheim's OB-X8 lands, carrying on the OB legacy from 1979 with help from Dave Smith".MusicTech.Retrieved2022-05-18.