A1-X/1505B
| Brand | Altec, Altec Lansing |
| Series | Voice of the Theatre |
| Function | Speaker |
| Produced | 1982 |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 381 × 276 × 100 cm (W × H × D) |
| Weight | 1670lbs |
| Frequency Response | 40Hz-15kHz |
| Treble | 3x5 Multicellular Horn (Altec 1505B, Altec 30172, Altec288-16K (x2)) |
| Midrange/Bass | 15" Paper Cone (x6) (Altec 515E) |
| Sensitivity | 112dB/W/m |
| Impedance (Nominal) | 16Ω |
| Crossover Frequency | 500Hz (Altec N500FA) |
| Dispersion (Horizontal) | 105° |
| Dispersion (Vertical) | 60° |
| Power Handling | 120W |
| Enclosure Type | Front-Loaded Horn, Bass Reflex (Altec 210 (x3)) |
| Notes | Updated crossover |