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Message: <blockquote data-quote="Thnking" data-source="post: 2420653" data-attributes="member: 571105">The problem with the concert or similar excuse for using rear fill is that the music is recorded in 2 channels.  Time delayed cues and reverberated/reflected sounds are incorporated into the 2 channels.  They are recorded to be output from these 2 channels (front to back).  If you put rear speakers in, they are reproducing the same output as the front, which are supposed to contain front to back cues (along with all of the spatial cues).  Now these spatial and front to back cues are being output from more than 2 point sources (front speakers and rear speakers), essentially changing the original sound stage.The best way to reproduce stereo would be with 2 speakers, unfortunately 2 speakers can't handle the bandwidth reproduction so we use more.  Rear fill should be avoided.</blockquote>

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