Altec 1505B (c. 1976–1977)
A multi-cell constant-directivity horn designed for professional sound reinforcement in theaters, halls, and outdoor systems.
Overview
The Altec 1505B is a multi-cell horn manufactured by Altec Lansing around 1976–1977. Designed for use in professional audio environments, it was intended for integration into theater, hall, and outdoor loudspeaker systems. One of six models in Altec’s Multi-Cell Horn Series, the 1505B offers selectable diffusion characteristics to suit different acoustic applications. It supports either one or two driver units by changing the throat adapter, increasing its flexibility across installations.
Specifications
| Type | Multi-cell horn |
| Directional property | Horizontal: 105 degrees, Vertical: 60 degrees |
| Crossover frequency | 500Hz |
| Cell Configuration | 3x5 |
| Applicable throat | 30166 (1 Driver), 30172 (2 Drivers) |
| External dimensions | Width 775 x Height 470 x Depth 425 mm |
Design
The 1505B features a multi-cell design that provides consistent directivity across its operating range, making it suitable for large venues requiring controlled sound dispersion. It is part of a series where different horns can be selected based on the desired coverage pattern. The unit allows configuration with one or two drivers via interchangeable throat adapters. A hand-crafted wood replica of the 1505B was later produced by Markus Klug of Klughoerner.
Context
The Altec 1505B was used as part of "Voice of the Theater" sound systems and served in venues such as a 24,000-seat auditorium, where it formed the original installed system. Its design reflects Altec’s focus on professional-grade, high-efficiency loudspeaker solutions for demanding acoustic environments.
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