Altec A5 Voice of the Theatre (1945)

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 was never a home speaker. It was built for cinemas, to fill a dark room with orchestral scores and dialogue with no help from a big amplifier. It came out in 1945 as the top of Altec Lansing's Voice of the Theatre (VOTT) series, a line that had been taking shape since the late 1930s. These were industrial-grade loudspeakers, made to deliver consistent, high-pressure sound to large audiences. They dominated the field, and the VOTT series became the de facto industry standard in theatrical sound reinforcement.

Despite their commercial origins, the A5s have found a second life among audiophiles who want raw dynamic capability and minimal coloration. The horn-loaded design pairs high-frequency and low-frequency horns. That gives startling efficiency and transient speed, and a "sense of dynamic ease" even with vintage tube amplifiers. One owner found a vintage McIntosh MC225 to be a particularly good match, which suggests the A5s respond well to classic high-damping-factor electronics. Digital sources, including CDs, reportedly perform well through the system, which goes against the assumption that big horns only suit analog warmth.

These are not speakers for the faint of heart. They are big and heavy. The Altec 804A compression driver alone weighs 17.5 pounds. Installation is a structural question, not just an aesthetic one. They need space, both physical and acoustic, and they dominate any room they sit in. For those who can make room, the listening experience is closer to live performance than to reproduction.

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 uses separate high-frequency and low-frequency horns, standard for professional cinema systems of the era. Each driver works within a narrow, optimized bandwidth, which cuts distortion and raises output capability. The system's efficiency, reportedly around 106 dB/W/m, comes straight from this horn loading, so even modest amplifiers can drive the speakers to concert-hall levels. The high-frequency section often uses either the 1005B or 1505B horn. The ten-cell 1005B offers 2 dB more sensitivity than the fifteen-cell 1505B, though some accounts say the 1505B is 3 dB less sensitive, which points to 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, all 16-ohm variants built for high acoustic output and durability. The 804A weighs 17.5 pounds and is a good example of how overbuilt these parts are. On the low end, drivers like the 515B or 803B are paired with bass horn cabinets such as the 825B. That combination gives authoritative low-frequency extension without electronic equalization. The exact configuration varies between individual systems, because of factory options and decades of replacement and refurbishment.

Hiraga-Inspired Crossover with Adjustable Notch Filter

The A5 uses a crossover circuit, but in enthusiast circles the stock design has largely been superseded by the well-regarded aftermarket crossover developed by Jean Hiraga. It includes a notch filter aimed at a specific resonance in the high-frequency path, with a resistor at position R3 set to 24 ohms in the original specification. Owners report that this value can sound overly aggressive. The usual fix is to replace the fixed resistor with a pair of 16-ohm L-pads and Clarostat potentiometers (labeled R3-VR), so it can be tuned. One owner tried values between 24 and 35 ohms and settled near 30 ohms for a more balanced high-frequency response. "Hiraga-inspired crossovers" are now a common upgrade path among current owners.

Historical Context

The Altec A5 was developed as part of the Voice of the Theatre series, which began in the late 1930s and by the 1940s had become the standard for cinema sound systems worldwide. The line was designed for the demands of movie theaters - high output, wide dispersion, and durability - and included other models such as the A-4 and A-7. The A5, introduced in 1945, refined this approach by combining proven horn technology with sturdy driver design. Its success cemented Altec Lansing's reputation in professional audio.

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