Altec Lansing 511B
A cast aluminum sectoral horn unit designed for professional and high-fidelity audio applications
Overview
The Altec Lansing 511B is a two-piece sectoral horn unit built for precise sound dispersion in both professional and home hi-fi environments. Manufactured by Altec Lansing, it features a 1" throat and a 1/2" thick flange, constructed from die-cast aluminum for durability and acoustic consistency. Slightly larger than the 811B, the 511B delivers uniform sound pressure distribution across a 90° horizontal and 40° vertical coverage pattern, making it effective for use in theaters, halls, and high-fidelity systems. It was specifically used with the A7-500 system and pairs with drivers such as the 802-8D, 806-8A, and 808-8A.
Specifications
| Crossover frequency | 500 Hz |
| Directional characteristics (horizontal x vertical) | 90° x 40° |
| Dispersion | 90° horizontal x 40° vertical |
| Compatible Drivers | 802-8D, 806-8A, 808-8A |
| Dimensions | Width 633 x Height 270 x Depth 500 mm |
| Weight | 8.1kg |
| Material | Cast aluminum |
| Flange | 1/2" thick |
| Throat | 1" |
| Frequency Response | 500 Hz to 16 kHz |
Design
The 511B is an aluminum die-cast sectoral horn with a two-piece construction, designed for consistent acoustic performance. It provides wide diffusion characteristics and uniform sound pressure distribution across its specified dispersion angles. The 1" throat and 1/2" thick flange support secure driver mounting and structural integrity.
Context
Priced at ¥29,300 around 1970, the 511B increased to ¥37,000 by 1976, reflecting its role in professional and high-end audio installations. It was used in the A7-500 system and valued for sound reproduction in theaters and halls, while also gaining popularity among home hi-fi enthusiasts for its clear, natural horn sound.
Market
Currently valued between $200 and $300, the 511B remains a sought-after vintage horn. Some units show a small crack in the flange, though they may still be in otherwise good condition.
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