Altec Lansing 615B (1968)
A high-efficiency coaxial composite speaker unit for PA systems, introduced in 1968.
Overview
The Altec Lansing 615B is a coaxial composite speaker unit designed for public address applications, released in 1968. It combines a 38 cm cone-type woofer and a horn-type high-frequency unit in a single coaxial assembly to deliver large sound output with high efficiency. The system was engineered for robust performance in professional audio environments.
Specifications
| Type | 38 cm coaxial speaker unit |
| Units used | For low band: 38 cm cone type; For High Frequency: Horn Type |
| Frequency characteristic | 20 Hz to 12 kHz |
| Lowest resonance frequency | 25Hz |
| Impedance | 16 Ω |
| Allowable input | 35W |
| Crossover frequency | 1.55kHz |
| Weight | 12.6kg |
| Original price | ¥ 130,700 (1 unit, around 1970) |
Design
The 615B uses a 38 cm cone-type woofer for low-frequency reproduction and a horn-type high-frequency unit featuring a water-drop equalizer known as the "Meat Bonner" to achieve excellent directional characteristics. The high-frequency driver includes a phenolic diaphragm for improved input resistance, and the crossover network is mounted directly on the speaker frame.
Context
Introduced in 1968, the Altec Lansing 615B was designed for use in PA systems requiring high efficiency and powerful sound output, reflecting Altec Lansing's focus on professional audio solutions during this period.
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