NS-690III
| Brand | Yamaha |
| Manufacturer | Nippon Gakki Co. Ltd. |
| Function | Speaker |
| Produced | 1981-198? |
| Country | Japan |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 35.8 × 63 × 31.5 cm (W × H × D) |
| Weight | 27kg |
| Frequency Response | 35Hz-20kHz |
| Treble | 3cm Soft Dome |
| Midrange | 7.5cm Soft Dome |
| Bass | 30cm Paper Cone |
| Sensitivity | 90dB/W/m |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 800Hz, 6kHz |
| Enclosure Type | Sealed |
| Finish | Walnut |