AS-21U "Legato-Compact"
| Brand | Heathkit |
| Manufacturer | Heath Company, Daystrom, Incorporated |
| Function | Speaker (Kit) |
| Produced | 1961 |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 81.3 × 82.3 × 48.3 cm (W × H × D) |
| Weight | 132lbs (Shipped) |
| Frequency Response | 30Hz-22kHz |
| Treble | Exponential Horn (Altec) |
| Midrange/Bass | 12" Paper Cone (x2) (Altec) |
| Impedance (Nominal) | 16Ω |
| Crossover Frequency | 800Hz |
| Power Rating (Program Material) | 30W |
| Enclosure Type | Sealed |
| Enclosure Construction | 0.75" Plywood |
| Finish | Unfinished |
| MSRP (1961) | $224.95 |