Altec Lansing DIG mkII (1974)
A bookshelf speaker system released in 1974, featuring a coaxial driver and bass reflex cabinet design.
Overview
The Altec Lansing DIG mkII is a bookshelf-type speaker system introduced in 1974 as an improved version of the earlier DIG model. It uses a single 20 cm coaxial speaker unit (model 409B) combining a woofer and tweeter in a shared axis configuration. The system is designed with a bass reflex cabinet to enhance low-frequency response and is intended for use as a compact yet high-performance audio solution.
Specifications
| Type | 2-Way, 1-Speaker, Bass Reflex System, Bookshelf Type |
| Units used | 20 cm Coaxial Type (409B) |
| Woofer | 20 cm cone type |
| Tweeter | Cone Type |
| Impedance | 8 Ω |
| Playback frequency band | 50 Hz to 14 kHz |
| Allowable input | 16W (continuous program) |
| Output sound pressure level | 100 dB (New JIS) |
| Crossover frequency | 2kHz |
| External dimensions | Width 372x Height 642x Depth 286 mm |
| Weight | 18.0kg |
| Original price | ¥ 29,800 (1 unit, around 1976) |
Design
The DIG mkII features a 20 cm coaxial speaker unit (409B) with a cone woofer and cone tweeter arranged in a coaxial structure. A special diffuser is mounted in front of the tweeter to improve high-frequency directional characteristics. The cabinet employs a bass reflex system to extend low-frequency output, and the overall design reflects an evolution from the original DIG speaker with enhanced acoustic engineering.
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