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==Subjective room acoustics==
The apparent source width and other subjective sound properties in many concert halls have been rated by experts, like [[Conducting|conductor]]s and [[Music criticism|music critics]]. Together, apparent source width and listener envelopment are the most important contributors to the spaciousness impression of a concert hall which is the most important contributor to the quality ratings of concert halls.<ref name=beranek />
In the field of subjective [[room acoustics]] the sound radiation characteristics are ignored and the apparent source width is explained by means of objective measures of room [[impulse response]]s, like the binaural quality index, the lateral energy fraction and the early sound strength.<ref name=beranek /><ref name=ziemer /><ref name=blau /> These tend to correlate with the subjective expert ratings. Accordingly, early, incoherent, lateral reflections together with a high [[loudness]] of low frequencies in the early reflections of the room reverberation increase the appatent source width and thus the overall spaciousness and quality of a concert hall. This knowledge is used in [[architectural acoustics]] to design a concert hall that exhibits the desired acoustical properties.
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