Westone Spectrum bass guitars
| Model name | Manufacturer | Production dates (Approx) |
|---|---|---|
| SPECTRUM DX (X635) | Matsumoku to Jan 1987 | 1985-87 |
| SPECTRUM GT (X650) | Matsumoku to Jan 1987 | 1985-88 |
| SPECTRUM LX (X695) | Matsumoku to Jan 1987 | 1985-87 |
| SPECTRUM ST (X630) | Matsumoku to Jan 1987 | 1985-88 |
| SPECTRUM SERIES II | Probably all Korean | 1987-88 |
| SPECTRUM I (WEB110) | SLM Korean | 1989-90 |
| SPECTRUM II (WEB 220) | SLM Korean | 1989-90 |
| SPECTRUM V 5 STRING (WEB520) | SLM Korean | 1989-90 |