Altec Lansing 511B
A die-cast aluminum Celtal horn for professional sound reinforcement, designed for use with specific Altec drivers.
Overview
The Altec Lansing 511B is a Cetoral horn used in professional audio systems, manufactured by Altec Lansing. It was designed for effective sound reproduction in theaters and halls, offering uniform sound pressure distribution across a 90° horizontal and 40° vertical dispersion pattern. The horn was specifically applied with the A7-500 system and is noted as being slightly larger than the 811B model. It features wide diffusion characteristics and was built to pair with Altec drivers including the 802-8D, 806-8A, and 808-8A.
Specifications
| Crossover frequency | 500Hz |
| Directional characteristics (horizontal x vertical) | 90° x 40° |
| Compatible Drivers | 802-8D, 806-8A, 808-8A |
| External dimensions (1970 catalog) | Width 633 x Height 270 x Depth 500 mm |
| External dimensions (1976 catalog) | Width 595 x Height 270 x Depth 480 mm |
| Weight | 8.1kg |
Design
The 511B uses an aluminum die-cast Celtal horn construction, contributing to its durability and acoustic efficiency. It provides wide diffusion characteristics with consistent sound coverage, engineered for professional installation in large venues.
Context
Used as part of the A7-500 sound system, the 511B was optimized for theater and hall sound reinforcement. Its design prioritizes even sound distribution and compatibility with high-power Altec drivers, positioning it as a specialized component in Altec Lansing’s professional audio lineup.
Market
Original pricing for the 511B was ¥29,300 per unit around 1970, revised to ¥33,700 after 1970, and increased to ¥37,000 by around 1976.
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