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==Physics and perception==
Apparent source width is the aurally perceived extent of a sound source. Sometimes, it is defined as the impression that a source sounds larger than its optical size.<ref name="blau">{{cite journal |last1=Blau |first1=Matthias |title=Correlation of apparent source width with objective measures in synthetic sound fields |journal=Acta Acustica United with Acustica |date=2004 |volume=90 |issue=4 |page=720 |url=http://www.ingentaconnect.com/content/dav/aaua/2004/00000090/00000004/art00015# |accessdate=31 May 2018}}</ref> The impression results from several auditory cues, which are affected by sound radiation characteristics of the source itself and by characteristics of the room. Since the term 'apparent source width' has been used a lot in the field of subjective room acoustics to characterize how the room affects the perception of source size, the term 'perceived source extent' has been introduced to highlight that the perception results from both the sound surce and the room<ref name="psfs">{{cite book |last1=Ziemer |first1=Tim |title=Psychoacoustic Music Sound Field Synthesis |date=2020 |publisher=Springer |___location=Cham |isbn=978-3-030-23033-3 |url=https://doi.org/10.1007/978-3-030-23033-3 |accessdate=19 August 2019}}</ref>.
The [[auditory system]] has mechanisms that separate the processing of late [[reverberation]] from the processing of direct sound and early [[Reflection (physics)|reflections]] referred to as [[precedence effect]]. While the late reverberation contributes to the [[perception]] of listener envelopment and reverberance, the direct sound and the early reflections mostly affect [[Sound localization|source localization]], intimacy and the apparent source width.<ref name="beranek">{{cite book|last1=Beranek|first1=Leo Leroy|title=Concert Halls and Opera Houses: Music, Acoustics, and Architecture|date=2004|publisher=Springer|___location=New York|doi=10.1007/978-0-387-21636-2|isbn=978-1-4419-3038-5|edition=Second}}</ref> The balance of early and late arriving sound affects the perceived clarity, warmth and brilliance.
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