NS-550
| Brand | Yamaha |
| Manufacturer | Nippon Gakki Co. Ltd. |
| Function | Speaker |
| Produced | 1973 |
| Country | Japan |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 40 × 102 × 30 cm (W × H × D) |
| Weight | 32.5kg |
| Frequency Response | 55Hz-20kHz |
| Treble | 2" Dome (Yamaha JA-0505) |
| Midrange/Bass | 12.5"x18" Polystyrene (Yamaha JA-3505B) |
| Impedance (Nominal) | 8Ω |
| Crossover Frequency | 5kHz |
| Power Handling (Music DIN) | 30W |
| Enclosure Construction | Particleboard |
| System Resonance | 55Hz |
| Finish | White and Walnut |
| MSRP (1973) | $400 |