Micron 421
| Brand | General Sound |
| Function | Speaker |
| Produced | 1980 |
| Country | United States |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 13.3 × 20.1 × 16.5 cm (W × H × D) |
| Weight | 6lbs |
| Frequency Response | 125Hz-20kHz ±5dB |
| Treble | 1" Dome |
| Midrange/Bass | 4" Cone |
| Sensitivity | 86dB/W/m |
| Impedance (Nominal) | 4Ω |
| Crossover Frequency | 2.5kHz |
| Power Handling | 50W |
| Finish | Black, White, Walnut |
| MSRP (1980) | $125 |