Theta
| Brand | STR |
| Manufacturer | Sound Technology Research |
| Function | Speaker |
| Produced | 1975 |
| Country | United States |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Analog Hardware |
| Dimensions | 32.8 × 15 × 24.1 cm (W × H × D) |
| Frequency Response | 2kHz-30kHz |
| Driver | Horn-loaded Piezo (x5) |
| Energy Conversion | 31% |
| Impedance (Nominal) | 8Ω |
| Dispersion (Horizontal) | 270° |
| Dispersion (Vertical) | 120° |
| Power Handling | 200W |
| Finish | Walnut |
| MSRP (1975) | $75 |