Ionophone Type D-15
| Brand | Plessey |
| Manufacturer | The Plessey Company Ltd. |
| Function | Speaker (Tweeter) |
| Produced | 1956 |
| Country | United Kingdom |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Analog Hardware |
| Driver | Plasma |
| Brand | Plessey |
| Manufacturer | The Plessey Company Ltd. |
| Function | Speaker (Tweeter) |
| Produced | 1956 |
| Country | United Kingdom |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Analog Hardware |
| Driver | Plasma |