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Kienle Resonator System
The Kienle Resonator System (also known as Kienle Sound System or Kienle Resonator Organ) has been developed by Ewald Kienle since 1970 to replace the loudspeaker reproduction used for digital organs which is regarded as unsatisfactory by many churchgoers.
== Emittance Problem of Digital Organs ==
Loudspeakers often disturb the aesthetic overall impression in churches since, for acoustic reasons, they can only be hidden or covered insufficiently. More importantly, a loudspeaker cannot reproduce the sound characteristics of a pipe organ, such as the lively, spatially sound impression which is created by the tones moving between the organ pipes, or the high energetic efficiency factor and the projection of those tones into a space.
Furthermore, for the higher tones, the circular sound emittance characteristic for organ pipes can only be achieved to a very limited extent as loudspeakers become more directional at higher frequencies. So, in some cases, several loudspeakers are located next to each other in a (semi) circle to obtain a more even emittance. Another possibility is to install the loudspeaker with the diaphragm facing up, and down and to divert the sound from the loudspeaker using a cone fixed above and below it (a so-called circular emitter). Although the area of even emittance is extended on the horizontal plane, the problem of an even sound distribution cannot be solved in a satisfactory way if the audience is seated at different heights with respect to the emitting device.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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