A4 (1505) (Rev. 2)
| Brand | Altec |
| Manufacturer | Altec Lansing Corporation |
| Series | Voice of the Theatre |
| Function | Speaker |
| Produced | 1949 |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 204.5 × 275.6 × 100.3 cm (W × H × D) |
| Weight | 800lbs (Shipped) |
| Treble | 3x5 Multicellular Horn (Altec 1505, Altec 288B) |
| Midrange/Bass | 15" Paper Cone (x2) (Altec 515) |
| Crossover Frequency | 500Hz (Altec N-500-C) |
| Dispersion (Horizontal) | 100° |
| Dispersion (Vertical) | 60° |
| Power Handling | 40W |
| Enclosure Type | Front-Loaded Horn, Bass Reflex |
| Notes | Compression driver update |