Altec Lansing 612LC Easter (2003)

At 49kg, it doesn’t just sit on a stand—it claims it.

Overview

The Altec Lansing 612LC Easter isn’t a relic from the golden age of mid-century audio engineering, but a deliberate resurrection of it—launched in 2003 as a modern homage to the legendary 612 lineage. This is not a reissue in name only; it’s a full-bodied reinterpretation, built around the 604-8L coaxial driver, housed in a massive bookshelf-style enclosure that defies its classification. Altec Lansing released this speaker as a statement piece: a high-end, monument to their own legacy. Priced at ¥840,000 per unit at launch, it was never intended for the mass market. It and those who measure fidelity in decades, not decibels alone.

Despite its "bookshelf" designation, the 612LC Easter’s dimensions—655 mm wide, 750 mm tall, and 460 mm deep—make it a floor-standing presence. The 49kg weight hints at the density within: a cabinet crafted from Finnish birch plywood, with a baffle 24 mm thick and other panels at 18 mm, ensuring rigidity and resistance to resonance. The exterior wears a maple-colored finish achieved through multiple layers of solid paint and sealed with a special urethane coating, giving it a deep, durable luster. The front is covered in a Special Ultra Thin Jersey Cloth grille, stretched taut over a frame that doesn’t obscure the imposing 38 cm coaxial unit beneath.

This speaker is a 2-way, single-enclosure bass reflex system, but its engineering leans heavily on vintage principles updated with modern materials and simulation. The enclosure design reportedly emerged from repeated computer modeling and physical prototyping, all in service of refining the acoustic behavior of It’s a paradox: a speaker that looks backward but was built with tools the original designers never had.

Specifications

Key Features

38 cm Coaxial 2-Way Unit (604-8L)

At the heart of the 612LC Easter lies the 604-8L, a coaxial driver that places the high-frequency compression driver directly in the center of the 38 cm (15-inch) woofer cone. This design ensures time-aligned delivery of mid and high frequencies, a hallmark of Altec’s studio-monitor heritage. The coaxial layout minimizes phase issues and creates a coherent point source, contributing to the speaker’s precise imaging and wide dispersion.

Tangerine Phase Plug

The high-frequency section of the 604-8L incorporates a “Tangerine” phase plug—a name derived from its segmented, citrus-like geometry. This design reportedly expands the high-frequency bandwidth and increases output by improving the breakup characteristics of the diaphragm and smoothing the transition into the horn. The phase plug acts as both an acoustic lens and a mechanical stabilizer, reducing distortion and helping maintain clarity at high SPLs.

Manta Ray Rayhorn

Feeding the high-frequency driver is a horn described as a “manta ray Rayhorn,” constructed from a special plastic material. This shape and material combination is said to eliminate the “coloring” often associated with traditional horn designs—resonances or frequency peaks that imprint a sonic signature. The manta ray profile likely refers to the wide, flared mouth of the horn, which aids in controlled dispersion and smooth high-frequency roll-off.

Optimized Low-Frequency Components

For bass reproduction, the 604-8L uses a voice coil and damper made from materials selected for superior radiation efficiency. The coil design is described as “unique and improved,” suggesting a departure from earlier 604 variants, possibly in winding technique or thermal management. These enhancements aim to deliver tighter, more powerful low-frequency response despite the inherent limitations of a coaxial design where the center of the cone is occupied.

Rear-Mounted Network with Level Control

On the rear panel, the crossover network includes a single volume potentiometer for adjusting the level of the mid and high frequencies. This allows users to tailor the tonal balance to room acoustics or personal preference— The presence of this control suggests Altec anticipated varied installation environments and wanted to preserve sonic flexibility without requiring external equalization.

Enclosure Based on the 612

The cabinet is a direct evolution of the classic Altec 612, re-engineered using computer simulation and iterative prototyping. Though visually reminiscent of its ancestor, the internal bracing, porting, and panel thicknesses were refined to optimize performance with the updated driver. The use of Finnish birch plywood—known for its strength, stability, and fine grain—supports the structural demands of a high-output, low-distortion design. The baffle’s 24 mm thickness reduces diffraction and panel resonance, while the 18 mm side and rear panels balance rigidity with weight.

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