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joman

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  1. Jeff, As the wavelength of audio frequencies decreases, the sound is radiated into 2PI space, as the wavelength increases the radiation pattern takes on a 4PI space radiation pattern (omni-directional). You can only listen in the near-field in 2PI. This means that it is difficult to listen in the near-field at all frequencies. Line array type loudspeakers essentially project a cylindrical wavefront that minimizes reflections from the floor and the ceiling and if designed correctly will provide a good near-field experience. However, these loudspeakers are very tall and are not normally suitable for home use. If you can use them in your home they are good but would need to be at least 70% on the height of your room. Another method would be to listen with the loudspeakers away from walls and only two or three feet away from you. This tends to sound like headphones though. James R. Griffin PhD has written a very good document abd line array loudspeakers. This link http://www.diy-audio.narod.ru/litr/nflawp.pdf will provide all you need to know about line arrays and near-field listening. Another source of extremely in-depth knowledge is Seigfried Linkwtz' site "Linkwitz Lab" at http://www.linkwitzlab.com/ but you will need to search this site for the information you are looking for, but it is there.
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