- Cogent Field Coil Compression Drivers drivers#
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The high frequency horn is cast by OMA from aluminum alloy. A four-way horn system produces a massive sound due to the pair of subwoofer horns mounted at the rear.ĭesigned by David D’imperio, the Imperia’s 300hz midrange horn uses the incomparable Cogent DS1428 field coil compression driver. Oswalds Mill Audio (OMA) came up with an idea to create a four way horn system that was later called the OMA Imperia and became the ultimate speaker available for purchase for $280,000. The Imperia speaker incorporates 100hz and 300hz wooden conical horns made from a solid Pennsylvania Black Walnut, Cherry or Ash.
Cogent Field Coil Compression Drivers series#
The emphasis was on gear that could be worked on and with, not uber-pricey collectibles (although SP likely single-handedly caused prices of WEAltec 755s to skyrocket).Pin it OMA Imperia is a four-way horn system with a vertical series of conical horns covering 100Hz to 20kH and a two rear loaded subwoofer, that produces a rich and warm sound to rival any modern day speaker Horn articles covered building a variety of enclosures for Lowther drivers, Mauhorns, and a wide range of Klipsch and Altec variants. The air of discovery combined with a self-aware smirk has not been duplicated since.
Sound Practices featured a historically-aware DIY approach, with an artsy undertone from articles by Herb Reichert, Gordon Rankin, John Stronczer, JC Morrison, our own Haden Boardman, and of course Roberts himself.
Cogent Field Coil Compression Drivers drivers#
Hiraga introduced the Japanese ultra-fi horn compression drivers to the western world, including brands like Goto (as used in the gazillion-dollar Magico Ultimate system).Įdgar helped to popularize tractrix horn geometry, first postulated by Paul Voigt in the UK in the 1920s.īenefits claimedcompared to the more popular exponential horn geometry were lower coloration and more even distribution patterns. Cogent Field Coil Bass Compression Drivers To The The Onken was based upon the Jensen Ultraflex bass enclosure, which was originally a reflex-augmented corner horn the Onken adaptation converted it into a smaller reflex box, more suitable for smaller rooms. It was ground-breaking at the time, and along with Matti Otalas papers on TIM (transient intermodulation distortion), provoked a new examination of amplifier characteristics beyond standard static measurements. Messenger referred to a survey article by Hiraga, in which he tested the distortion characteristics of amplifiers euphonious tube amps showed mostly second-order distortion, nasty transistor amps showed mostly odd-order harmonics, and so on. I first encountered Hiraga in Paul Messengers Subjective Sounds column in Hi-Fi News, around 1977.
Cogent Field Coil Compression Drivers full#
Cogent Field Coil Bass Compression Full Details AreĪ close-up of the three front horns is shown at the top of the page, and full details are here.īurwen designed early products for Mark Levinson Audio Systems, as well as the killer Cello Audio Palette. You can find the articles reprinted here scroll down the page.Īlmost exactly the same size as the real thing, the Speakerlab K was said by many to have more extended bass than the legit K-horn.īurwen began construction of the system in 1962, and 55 years later thinks its about finished.
In 1967 he went go big or go home with a series of articles in Hi-Fi News on the massive concrete horns he built into his home (you can find the articles here scrolll down the page). Cogent Field Coil Bass Compression Series Of Articles US magazines rarely mentioned horns, but John Crabbe, Editor of the UK Hi-Fi News, had published horn-construction articles in Wireless World in 1958, and in Hi-Fi News in 1962. The best-known survivors were the Klipschorn and the JBL Paragon the Paragon was a custom-order item, and K-horns were rarely seen on sales-floors.Īcross the pond, there were still signs of life for horns, with attention from some unlikely sources. I wonder if Sarnoffs political connections were a factor I digress.
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