A polyphonic analog synthesizer with a 61-note keyboard. Manufactured in the early 80s.

The OB-Xa is an extended version of the OB-X. It is also available with 4-, 6- or 8-voice polyphony.

The synth tops its predecessor by offering 2 LFOs, a 4-pole (24dB/octave) VCF, split/layer keyboard functions, a computer interface plus internal memory storing up to 120 patches and 8 combinations, instead of the 32 sounds on the OB-X. Cross-modulations is no longer featured, but the filter envelope can be used with VCO2.

On the OB-Xa Oberheim switched from using SEM-based circuitry to Curtis hardware. The synth features CEM 3340 (VCO), CEM 3320 (VCF), CEM 3310 (EG) and CEM 3360 (VCA) chips.


back to Oberheim

Log in or registerto write something here or to contact authors.