Altec Lansing 409B (1968)
A 2-way 20 cm coaxial speaker unit released in 1968 with an 8 Ω impedance and 16W power handling.
Overview
The Altec Lansing 409B is a 2-way coaxial speaker unit introduced in 1968. It features a 20 cm cone-type woofer and a cone-shaped tweeter mounted in a coaxial configuration. Designed for full-range audio reproduction, it has a frequency response from 50 Hz to 14 kHz and operates at a nominal impedance of 8 Ω. The unit was priced at ¥10,500 around 1970, later revised to ¥11,700.
Specifications
| Diameter | 20 cm |
| Type | 2-way coaxial type speaker unit |
| Woofer type | 20 cm cone type woofer |
| Tweeter type | Cone-shaped tweeter (direct radiator) |
| Frequency response | 50 Hz to 14 kHz |
| Lowest resonance frequency | 80Hz |
| Impedance | 8 Ω |
| Allowable input | 16W |
| Crossover frequency | 2kHz |
| Weight | 1.35kg |
Design
A special diffuser is attached to the cone-shaped tweeter to improve the high-range directional characteristics.
Market
The Altec Lansing 409B was sold for ¥10,500 around 1970, with the price later increased to ¥11,700 per unit after a price revision.
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