Western Electric 24A Horn

It doesn't just project sound - it releases it, like air finally breaking free after being held too long.

Overview

The Western Electric 24A Horn isn't something you set on a shelf. It weighs 25 kg and is nearly a meter wide. This is industrial acoustic engineering from an era when sound reinforcement was meant to command a space, not disappear into the background. It was built to fill rooms, halls, and entire theaters. One unit's history confirms it, with a theater in Omaha, Nebraska that came down in the 1980s.

Scale is not the surprising part. The horn is made of sheet metal, so you'd assume it would ring, color the sound, and add its own metallic voice to the mix. Owners report the opposite: it stays out of the way. "It sounds very free and open," one listener said, and that comes up in every account. There's no strain and no congestion.

The 24A Horn was part of Western Electric's "MIRRO PHONIC SOUND SYSTEM," a complete set of drivers, networks, and amplifiers meant to deliver coherent, high-efficiency sound. It was a system, engineered from the ground up. The horn itself was designed to operate in the 200Hz range, in the midbass to lower-midrange zone. Its mouth flares quickly, more like a tractrix than a traditional exponential horn, which likely contributes to its even dispersion and lack of harshness.

Western Electric, founded in 1869 and later re-established in 1996 for the production of electron tubes and high-fidelity components, has a reputation for no-compromise engineering. The 24A Horn is not a consumer product in any modern sense. There's no cabinet to match your decor and no voicing to flatter poor recordings. It's raw and purpose-built.

It ships with the 594A driver as a single unit. It can also be used with the 555 driver, though that pairing belongs more properly to the 24B Horn system. The two are close enough in lineage and application that owners experiment, and the results, by all accounts, are revelatory. One listener described hearing the 555-driven version as "a real treat."

Specifications

Manufacturer	Western Electric
Flare	Designed for use in the 200Hz range
Mouth flare description	Flares quite fast at the mouth, more like a tractrix
Dimensions	W889 x H660 x D686 mm
Weight	25 kg
Throat	Uses 19A throat adapter
Driver	Uses 594A driver, 1 piece
Associated driver	Can be used with 555 driver (as part of 24B Horn system)
Associated amplifier	TA-7444A/TA-7376A
Associated power supply	TA-7257 or TA-7297
Associated network	86C network 41A+42A+43A

Key Features

Sheet metal construction with unexpected neutrality

You can feel the heft of the 25 kg sheet metal body the moment you lift it. What surprises most is what you don't hear. Metal horns often suffer from ringing, coloration, and a kind of "horn honk." But as one owner put it: "you would think the sheet metal would ring too much… but it doesn't." That lack of resonance is likely down to the shaping and bracing, probably informed by the foundational work of Wente and Thuras, whose designs influenced this horn's engineering. It delivers the driver's output with authority and control.

Tractrix-inspired mouth flare for smooth dispersion

The 24A's mouth doesn't taper gently. It flares aggressively, closer to a tractrix curve than the more common exponential profile. That rapid expansion helps manage wavefront coherence and reduces diffraction at the mouth, contributing to the "free and open" sound owners describe. The design favors even coverage and time alignment, especially in the 200Hz region where the horn operates. Sound fills a space without becoming localized or harsh.

Part of a complete Mirro Phonic system

The 24A Horn wasn't meant to stand alone. It's a component in Western Electric's "MIRRO PHONIC SOUND SYSTEM," a fully integrated chain that includes the 86C network (41A+42A+43A), amplifiers like the TA-7444A or TA-7376A, and power supplies such as the TA-7257 or TA-7297. This wasn't plug-and-play. Every piece was engineered to work within a specific electrical and acoustic window. The horn uses the 19A throat adapter and ships with the 594A driver, but it can also pair with the 555 driver (in the context of the 24B system), which shows the modularity in Western Electric's approach.

Driver compatibility expands sonic possibilities

The 594A driver is the designated match, but the 24A Horn also works with the 555 driver. The 555 is officially part of the 24B Horn system, but the physical and acoustic similarities allow cross-usage, and the results are highly regarded. One owner noted that a 597 tweeter "just blends perfectly" with the 24A, suggesting the horn plays well with other Western Electric drivers.

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