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Oswalds Mill Audio Monarch horn speakers

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Product Description

The OMA Monarch is a new approach to the two way speaker. For inspiration went back to early pre WWII horn theater speakers, which often used dual 15" woofers, and baffles to extend and improve low frequency response. The "wings" of the Monarch are functional baffles which help the two 15" woofers mounted in a unique enclosure deliver bass that no high end design using small woofers can even hope to match. The extremely high 104db efficiency (1w/1m) means any low powered tube amplifier can drive the Monarch. Large solid wood baffles not only help load the woofers but also make room placement far less demanding. OMA's proprietary cast aluminum alloy horn and compression driver cover the midrange and high frequencies, with superb integration due to a simple crossover network.

The Monarch is available in a range of wood types and finishes. Shown in Pennsylvania Black Walnut.

Height 180cm
Width 130cm (max width at wings)
Base Footprint 97 x 56cm


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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