Western Electric KS-12024 (1940)
A very good little horn that is hard to find and expensive when you do.
Overview
Described by one evaluator as “the finest sounding little horn,” the Western Electric KS-12024 is a folded metal horn with a near-mythical reputation among vintage audio collectors. It is also hard to find. Most of them sit in old Bell System closets or in the collections of people who tracked one down.
Western Electric was the engineering backbone of the Bell System from 1881 to 1984. The KS-12024 was never built for audiophiles. It was built to work, and work reliably, as part of a telecommunications infrastructure. At some point someone hooked it up to a proper driver and found it reproduced music with real clarity and presence, not just speech. The horn is a compact folded design made of wood and bronze. Those materials were chosen for durability and resonance characteristics, and they happen to work well for audio.
The horn was originally paired with the Western Electric 720A driver, or its equivalent, the KS-14704 receiver, and the two were designed as a complete unit. The horn’s 1-inch throat accepts a range of modern 1-inch drivers, so it adapts to contemporary setups. Purists insist it only comes alive with the correct vintage driver. Owners report that once you hear it properly measured and playing music, it’s easy to see why it took “some months to find one and then a small fortune to obtain it.”
Specifications
| Manufacturer | Western Electric |
| Driver compatibility | 1-inch throat, accommodates many modern 1-inch drivers |
| Impedance | 16 ohms |
| Frequency response | 300 Hz to 15,000 Hz |
| Power handling | 10 watts |
| Magnet weight | 3.5 lbs |
| Weight | 7.5 lbs |
| Diaphragm material | Aluminum |
| Phase plug | Tangerine |
| Mounting | 4-bolt pattern |
Key Features
Materials and Build
The KS-12024 isn’t flashy. The horn body combines wood and bronze, selected for acoustic resonance and long-term stability under real-world conditions. This wasn’t boutique craftsmanship. It was Bell Labs-grade engineering meant to last decades in public installations. The horn projects sound efficiently and shapes it with a smooth, natural character that modern plastic or stamped-metal horns rarely match.
Driver Integration
The horn has an aluminum driver throat and comes with an aluminum driver cover, both contributing to a tight, reflective path for high-frequency energy. The driver itself, originally the WE 720A or KS-14704, uses an aluminum diaphragm and a Tangerine phase plug, a design known for minimizing turbulence and breakup in the high end. The phase plug has a distinctive segmented dome and helps maintain coherent wavefronts across the horn’s operating range of 300 Hz up to 15 kHz. That is good reach for a horn this size.
Mounting and Compatibility
The KS-12024 works well with modern gear. Its 1-inch throat fits a wide range of contemporary compression drivers, which has helped it survive beyond its original telecom role. The 4-bolt mounting pattern holds it securely, though collectors note that original units sometimes show cracks or stress marks in the mounting tabs, likely from decades of installation and removal. The horn’s 16-ohm impedance and 10-watt power handling mean it isn’t suited for high-output applications. In low-wattage tube setups it does well.
Historical Context
Western Electric was the primary manufacturer and supplier for the Bell System from 1881 to 1984, which put it at the center of American telecommunications engineering. The KS-12024 came out of that ecosystem as a component in public address and signaling systems, not as a consumer audio product. It was designed to be paired with the WE 720A driver (or its equivalent, the KS-14704 receiver), forming a complete horn loudspeaker system built for clarity and durability. No specific production years have been confirmed for the KS-12024, but its design and materials align with Western Electric’s output from the 1940s, when the company was refining compact, high-efficiency horn systems for widespread deployment.
Collectibility & Value
Finding a genuine KS-12024 today is hard. It’s considered rare, and original units often show age-related wear: paint spots, surface dirt, small dents, or cracked mounting tabs. The driver cover, when present, is described as “rare,” which makes complete, unrestored sets more valuable. A full set (KS-12024 horn and KS-14704 receiver) sold for 200,000 JPY in a 2020 auction. One reviewer noted it took “some months to find one and then a small fortune to obtain it.” A reproduction version is available from Azzolina Audio.
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