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.

Similar items on eBay

No exact Altec 612C Monitor listings are live right now — these searches show current Altec and similar vintage audio gear on eBay:

Search Altec 612C Monitor on eBay Browse Altec audio gear on eBay

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.