US-1
| Brand | Heathkit |
| Manufacturer | Heath Company, Daystrom, Incorporated |
| Function | Speaker |
| Country | United States |
| Model ID | Utility Speaker |
| Form Factor | Part |
| Signal Path | Passive Hardware |
| Dimensions | 30.5 × 30.5 × 0 cm (W × H × D) |
| Weight | 7lbs (Shipped) |
| Frequency Response | 50Hz-9kHz ±5dB |
| Impedance (Nominal) | 8Ω |
| Power Handling | 12W |
| Magnet Weight | 6.8oz |
| MSRP (1959) | $10.95 |
| Notes | 401-6 updated with new brand coloring and model number format. |