2) The annulation of the speaker's distortion by phase opposition." Annulation meaning, of course, elimination. "They are installed in a push-pull configuration to gain the following advantages: 1) The reduction of a half of the load volume for a moderate floor space. The bottom upward-facing driver is secured to a 2mm-thick wooden baffle, and the second driver is mounted on the other side of the same baffle, facing its twin and wired out of phase for push-pull operation. Here we find an unusually shaped bass-reflex cabinet with two 15" drivers mounted face-to-face in an compound or "Isobarik" configuration. We'll ratchet-in now for a closer look at each module.īass (up to 180Hz). A horn working through a too wide frequency range (for example 150Hz up to 7kHz) will compulsorily generate distortions above 200Hz, the high-sensitivity range of human hearing." Bad quality horn speakers only add to the subject. "Horn distortion problems are real and you can calculate them precisely. We'll come back to this directivity issue in a few moments. The Eurythmie's directivity is perfectly controlled and optimized, and is more marked than with other horn speakers." (It is better to minimize the effect of the room because reverberations confuse and mask some information). The Mid-Low horn (180Hz to 700Hz) is separate from the Mid-High horn (700Hz to 7kHz) in order to improve directivity and to get away from reverberation problems. "Above 180Hz the horn system is in three-ways to respect some important design parameters such as directivity control and distortion. In spite of their size, they don't visually overpower the room. They're not small: about 60" high, with a width at the front face of almost 28", and a similar depth at the base. Of course, restitution with a horn in this range is the ideal solution." But of course. Too many concessions would have to be made for a bass horn. That's the best compromise if you want to have a speaker with reasonable dimensions, that is transportable, and has a pleasant aesthetic. We have therefore prioritized this range and kept the advantages of a drum." (that's a dynamic moving-coil driver, which they dub isodynamic) ".for the bass range. "With the Eurythmies, the bass crossover frequency of 180Hz allows a maximum of fundamental tones to be reproduced by the horn transducersthe pitch, the treble clef, and the bass clef are present in frequencies from 180 to 800Hz. Hence our optimized four-driver system: Bass, Mid-Low, Mid-High, and Treble." See, it's Franglais, but it gets the point across. "A horn speaker's design is based upon calculations that determine the correct shape to amplify a certain range of frequencies.
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