A1 (1505) (Rev. 3)
| Brand | Altec |
| Manufacturer | Altec Lansing Corporation |
| Series | Voice of the Theatre |
| Function | Speaker |
| Produced | 1955 |
| Country | United States |
| Model ID | A-1 |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 386.1 × 287 × 100.3 cm (W × H × D) |
| Weight | 2200lbs (Shipped) |
| Treble | 3x5 Multicellular Horn (Altec 1505, Altec 288B (x2)) |
| Midrange/Bass | 15" Paper Cone (x6) (Altec 515B) |
| Crossover Frequency | 500Hz (Altec N-500-C) |
| Dispersion (Horizontal) | 105° |
| Dispersion (Vertical) | 60° |
| Power Handling | 100W |
| Enclosure Type | Front-Loaded Horn, Bass Reflex |
| Notes | Updated woofer |