Gamma II
| Brand | STR |
| Manufacturer | Sound Technology Research |
| Function | Speaker |
| Produced | 1975 |
| Country | United States |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 37.5 × 60.7 × 31.8 cm (W × H × D) |
| Weight | 43lbs |
| Frequency Response | 37Hz-21kHz ±5dB |
| Treble | 3" Paper Cone (Phenolic Ring, CTS) |
| Bass | 10" Paper Cone |
| Sensitivity | 93dB/W/m |
| Impedance (Nominal) | 6Ω |
| Crossover Frequency | 1.5kHz |
| Power Handling | 30W |
| Enclosure Type | Sealed |
| Finish | Walnut-grained Vinyl |
| MSRP (1975) | $108 |