Stereo base

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In stereo reproduction, the stereo base is the loudspeaker base , i.e. the image width between two loudspeakers in the stereo arrangement when the listener is ideally located in a corner of the equilateral stereo triangle .


The stereo base, i.e. the distance between the speakers, can be 1 meter wide with nearfield monitoring or usually 2 to 3 meters in a living room, but also 5 to 10 meters in a sound film theater (cinema). There are no more precise regulations for the base width . The optimal listening position is on the center line between the loudspeakers.

The word loudspeaker base is adequate to the term microphone base , in which, for example, when recording in runtime stereophony, the microphones have a certain distance from each other. If you approach the loudspeaker front on the center line, there is the effect that the middle of the sound sources move upwards, which is known as elevation .

The stereo base, i.e. the dimensions of the loudspeaker front , also includes the term stereo triangle , which includes the listening position in the equilateral triangle. The three angles of the triangle are each 60 °. As seen from the listener, the loudspeakers L and R are in a direction of ± 30 °. In practice, it is common to divide the loudspeaker base linearly into the direction of the audio event . The direction of a loudspeaker is the direction of the auditory event 100%. The center is 0% and exactly between the center and a loudspeaker is the audio event direction HL (half left) or HR (half right) with the audio event direction 50%.

Elevation or elevation

The elevation or elevation of the phantom sound sources above the connecting line between the loudspeakers results from the contradiction that the hearing receives identical signals from a real mid-range sound source, but these actually do not arrive from the front, but from halfway to the side. This related falsification of the timbre must appear illogical to the ear from its experience. It reacts with the apparent elevation of the phantom sound source in the center, which is also known as the rainbow effect.

Stereo base when taking photos

In stereo cameras and stereoscopy , the distance between the two cameras is also referred to as the stereo base.


  • Michael Dickreiter, Volker Dittel, Wolfgang Hoeg, Martin Wöhr (eds.): Handbuch der Tonstudiotechnik , 8th, revised and expanded edition, 2 volumes, publisher: Walter de Gruyter, Berlin / Boston, 2014, ISBN 978-3-11- 028978-7 or e- ISBN 978-3-11-031650-6
  • Gustav Büscher, A. Wiegemann: Little ABC of electroacoustics. 6th edition, Franzis Verlag, Munich, 1972, ISBN 3-7723-0296-3 .
  • Thomas Görne: Sound engineering. 1st edition, Carl Hanser Verlag, Leipzig, 2006, ISBN 3-446-40198-9 .

See also

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