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Oswalds Mill Audio AC-1 horn speakers

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Product Description

The OMA AC1 is a three way floor standing loudspeaker constructed entirely out of solid Pennsylvania hardwood - 1" thick walnut, cherry, chestnut, tiger maple or ash using the same joinery construction found in the finest furniture. It is completely hand built and hand finished with oil and wax. It uses an extremely efficient 15" woofer, front ported, for bass. 

The midrange utilises a very special vintage compression driver made by RCA for actual movie theaters, mounted to our conical 300hz horn, crafted from the same hardwoods as the bass enclosure. It uses the most high tech, best engineered ribbon tweeter ever made, also horn loaded. It is built to operate continuously without failure as the theater systems of the past. In short, no compromises were made on the design or construction of this loudspeaker, except for its size.

The AC1 will perform best in medium to large sized rooms, and is highly efficient, at 100db/1w/1m. Even a low powered tube amplifier will find the AC1 an easy load to drive. Standard finishes for stands and hardware: black wrinkle, white, copper plate and nickel plate. Custom finishes also available.

Height 208cm
Max horn width 74cm
Max horn depth 81cm


Horn speakers in general are a breed apart from conventional loudspeakers, which radiate sound in all directions. Horn speakers are both far more efficient than conventional ones, and also directional, which means that the music is aimed where you want it, not reflected in every direction. This dramatically reduces negative room interactions, which is very important, but the overall effect is to give a sense of lifelike, natural effortlessness to the music itself. Many people who listen to OMA speakers for the first time say the same thing; they did not believe reproduced music could sound so good. 

From a more technical standpoint, there are simple reasons for this. OMA is the only hifi company in the world today which relies solely on the conical profile in its horn designs. The conical profile, meaning the horn walls have straight sides, does not deform the spherical wave of sound created by the horn.


All OMA products are made within a very small area of Eastern Pennsylvania, the part of the United States which gave birth to the industrial revolution and which continues to excel in small manufacturing. Our horns are cast at a local foundry, our slate comes from the last quarry in Pennsylvania, our wood is from the surrounding forests. Many of our products are entirely hand made by skilled artisans, and yet we also use cutting edge technology like five axis water jet machining. 


Our acoustical designer Bill Woods has been designing horn loudspeakers professionally for over 35 years. He is one of a handful of the world's top experts on horns. Once Bill has set the acoustical parameters for a proposed speaker, such as the size and flare of the horn or horns, enclosure volume and geometry, selection of drivers, etc, OMA's industrial designer David D'Imperio is tasked with creating a visually arresting design that maintains it's acoustic integrity. The history of loudspeaker design shows that aesthetic beauty and acoustic excellence have rarely occurred in the same package. D'Imperio creates an individual identity for each speaker design, following from its acoustic goals.

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