NS-20A
| Brand | Yamaha |
| Manufacturer | Nippon Gakki Co. Ltd. |
| Function | Speaker |
| Produced | 1970 |
| Country | Japan |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 85 × 66 × 36 cm (W × H × D) |
| Weight | 28kg |
| Treble | 2" Paper Cone (Yamaha JA-0505) |
| Midrange | 8" Paper Cone (Yamaha JA-2053) |
| Bass | 20"x27" Polystyrene (Yamaha JA-5002) |
| Impedance (Nominal) | 8Ω |
| Power Handling | 20W |
| Enclosure Type | Open Baffle |
| Finish | Walnut |