Altec Lansing 311-90
A sectoral horn for wide horizontal sound dispersion, part of the "Voice of the Theater" line.
Overview
The Altec Lansing 311-90 is a sectoral horn designed for large-scale sound reproduction where wide sound pressure distribution is essential. Built for use in wide listening rooms, halls, or outdoor environments, it provides a horizontal dispersion of 90° and a vertical dispersion of 40°. It was developed as part of Altec Lansing’s professional audio lineup, specifically within the "Voice of the Theater" series, differentiating itself from the 311-60 model by offering a broader horizontal coverage angle.
Specifications
| Type | Sectoral horn |
| Directional property | Horizontal: 90°, Vertical: 40° |
| Crossover frequency | 300 Hz or more |
| Compatible Driver Units | 288C, 288D, 290E, 291-16A |
| External dimensions | Width 725 x Height 326 x Depth 535 mm |
| Weight | 13 kg |
Context
The 311-90 was engineered for installations requiring broad horizontal sound coverage, making it suitable for large venues where even sound distribution is critical. It is part of the same product family as the 311-60, differing primarily in its wider 90° horizontal dispersion. This model belongs to Altec Lansing’s "Voice of the Theater" line, a series developed for professional sound reinforcement applications.
Market
Originally priced in Japan at ¥107,300 around 1970, the 311-90 was later revised to ¥136,100 post-1970, then adjusted to ¥125,400 by 1976. Today, a pair is listed at a current asking price of $1000.00.
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