Altec Lansing 601-8D (1970)
A 2-way 30 cm coaxial composite speaker unit released in 1970 for monitor use with extended high-frequency response.
Overview
The Altec Lansing 601-8D is a 2-way 30 cm coaxial composite speaker unit developed for monitor applications. Released in 1970, it was designed to offer high-fidelity sound reproduction in a more compact form compared to larger 38 cm coaxial models, making it suitable for installations with limited space. It belongs to Altec Lansing’s "DUPLEX" series, which includes well-known models like the 604 and 605.
Specifications
| Units Used | For low band: 30 cm cone type; For High Frequency: Horn Type |
| Frequency characteristic | 30 Hz to 20 kHz |
| Lowest resonance frequency | 39Hz |
| Impedance | 8 Ω |
| Rated input | 20W |
| Allowable input | 35W |
| Output sound pressure level | 98dB/W/m |
| Magnetic flux density | Low band: 10,400 gauss; For high frequency: 10,000 gauss |
| Crossover frequency | 3kHz |
| External dimensions | Diameter 308x Depth 143 mm |
| Weight | 6.8kg |
| Original price | ¥82,300 (1 unit, released in 1970) |
Design
The 601-8D features a 30 cm cone-type woofer for low-frequency reproduction and a zinc die-cast multi-seller horn for high frequencies, arranged in a coaxial configuration. It was engineered to fit in tighter spaces while maintaining broad frequency response. Directional characteristics remain consistent into the ultra-high range, with measured high-frequency extension reaching beyond 22 kHz despite a rated upper limit of 20 kHz.
Context
The 601-8D is part of Altec Lansing’s "DUPLEX" series, sharing product lineage with models such as the 604 and 605. It was released in 1970, according to source documentation.
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