Altec Lansing 612C Monitor (1975)
A floor-standing, bass reflex monitor speaker system refined from the 612A, released in 1975.
Overview
The Altec Lansing 612C Monitor is a two-way, single-speaker bass reflex system designed for professional and high-fidelity audio use. Introduced in 1975, it evolved from the long-used 612A system, with refinements focused on low-frequency performance. The speaker features a coaxial driver configuration and was built to meet demanding audio reproduction standards of its era.
Specifications
| Impedance | 8 Ω |
| Playback frequency band | 20 Hz to 20 kHz |
| Crossover frequency | 1.5kHz |
| External dimensions | Width 648x Height 749x Depth 508 mm |
| Driver | 38 cm coaxial type unit |
| Driver (initial) | 38 cm coaxial type (604-8G) |
| Driver (mid-term, 1979) | 38 cm coaxial type (604-8H) |
| Driver (late stage, 1981) | 38 cm coaxial type (604-8KS) |
Design
The 612C is equipped with a 38 cm coaxial type unit and was refined from the 612A system. The bass reflex port is precisely adjusted to enhance low-frequency response. Different driver units were used over its production run, including the 604-8G, 604-8H (1979), and 604-8KS (1981) models.
Context
Released in 1975, the 612C Monitor was developed as an evolution of the long-serving 612A system, aiming to improve bass performance through precise tuning of the bass reflex port.
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