Altec A5 Voice of the Theatre (1945)

Name: Altec A5 Voice of the Theatre
Brand: Altec

At 106 dB/W/m, these speakers don’t just play loud—they command the room like a conductor stepping onto the podium.

Overview

The Altec A5 Voice of the Theatre isn’t a relic of home audio—it was built for the footlights, engineered to fill darkened cinemas with the unamplified force of orchestral scores and booming dialogue. Released in 1945, it arrived as the crown jewel of Altec Lansing’s Voice of the Theatre (VOTT) series, a line that had been taking shape since the late 1930s and would go on to define cinema sound for decades. These weren’t prototypes or experiments; they were industrial-grade loudspeakers designed to deliver consistent, high-pressure audio across large audiences, and their dominance made the VOTT series the de facto industry standard in theatrical sound reinforcement.

Despite their commercial origins, the A5s have found a second life among audiophiles who prize raw dynamic capability and minimal coloration. Their horn-loaded design—pairing high-frequency and low-frequency horns—translates into startling efficiency and transient speed, allowing them to play with a “sense of dynamic ease” even when driven by vintage tube amplifiers. One owner found a vintage McIntosh MC225 to be a particularly synergistic match, suggesting that the A5s respond well to classic high-damping-factor electronics. Digital sources, including CDs, reportedly perform well through the system, defying assumptions that such large horns are only suited to analog warmth.

Still, these are not speakers for the faint of heart. Due to their sheer size and weight—exemplified by components like the 17.5-pound Altec 804A compression driver—installation is a structural consideration, not just an aesthetic one. They demand space, both physical and acoustic, and their presence dominates any room they occupy. Yet for those willing to accommodate them, the payoff is a listening experience that feels less like reproduction and more like live performance.

Specifications

Manufacturer	Altec Lansing
Impedance	16 Ohm
Efficiency	approximately 106 dB/W/m
Components can include	1005B high-frequency horns, 1505B horns, 288C high-frequency compression drivers, 515B low-frequency drivers, 825B bass horn cabinets
Bass driver (example)	803B 16-Ohm bass drivers
Compression driver (example)	Altec 288-16k compression
Compression driver (example)	Altec 804A 16-Ohm compression driver
Driver weight (example)	17.5 pounds

Key Features

Horn-Loaded Dual-Way Design

The Altec A5 relies on separate high-frequency and low-frequency horns to achieve its performance, a hallmark of professional cinema systems of the era. This dual-horn architecture allows each driver to operate within a narrow, optimized bandwidth, reducing distortion and increasing output capability. The system’s efficiency—reportedly around 106 dB/W/m—is a direct result of this horn loading, meaning even modest amplifiers can drive the speakers to concert-hall levels. The high-frequency section often features either the 1005B or 1505B horn, with the ten-cell 1005B offering 2 dB more sensitivity than the fifteen-cell 1505B, though some accounts suggest the 1505B is 3 dB less sensitive, indicating variability in implementation or measurement.

Compression Drivers and Low-Frequency Units

High-frequency reproduction is handled by compression drivers such as the 288C, 288-16k, or 804A models, all 16-ohm variants designed for high acoustic output and durability. The 804A, weighing in at 17.5 pounds, exemplifies the overbuilt nature of these components. On the low end, drivers like the 515B or 803B are paired with bass horn cabinets such as the 825B, forming a system capable of authoritative low-frequency extension without the need for electronic equalization. The exact configuration varies between individual systems, reflecting both factory options and decades of replacement and refurbishment.

Hiraga-Inspired Crossover with Adjustable Notch Filter

While the A5 uses a crossover circuit, the stock design has been largely superseded in enthusiast circles by the well-regarded aftermarket crossover developed by Jean Hiraga. This design includes a notch filter targeting a specific resonance in the high-frequency path, with a resistor at position R3 set to 24 ohms in the original specification. However, owners report that this value can sound overly aggressive, leading to modifications such as replacing the fixed resistor with a pair of 16-ohm L-pads and Clarostat potentiometers (labeled R3-VR), allowing for fine-tuning. One owner experimented with values between 24 and 35 ohms, ultimately preferring a setting near 30 ohms for a more balanced high-frequency response. The flexibility of this mod has made “Hiraga-inspired crossovers” a common upgrade path among current owners.

Historical Context

The Altec A5 was developed as part of the broader Voice of the Theatre series, which began in the late 1930s and evolved through the 1940s into the standard for cinema sound systems worldwide. Designed specifically to meet the acoustic demands of movie theaters—high output, wide dispersion, and durability—the VOTT line included other models such as the A-4 and A-7. The A5, introduced in 1945, represented a refinement of this philosophy, combining proven horn technology with robust driver design. Its success cemented Altec Lansing’s reputation in professional audio and laid the groundwork for decades of influence in both cinema and high-end audio.

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