Loudspeakers having an ideal frequency response in an anechoic room sound different in monitor rooms having other acoustic properties. In these rooms, which are not ideal from the acoustical point of view, the sound is reflected to the listener with frequency responses differing so much from one another that the first (nonreflecting) sound component is received with an ideal response, whereas the delayed ground-reflected sound features a bass boost, the sound reflected by the ceiling makes an extremely present impression and in the lateral reflections the lower midrange is missing. These great deviations of the polar pattern are due to the frequency differences. This paper describes an active monitor loudspeaker system having a practically uniform polar response over the total listening range.
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