To do this well, the rear speakers should not (with the exception of localized 5.1 channel effects) call attention to themselves as sources of sound. (polkaudio.com)
Was it the multiple sources of sound competing against the fireworks? (ngap.org)
So you will hear the front, side, and rear channels as individual and distinct sources of sound... but it's still all coming from in front of you. (howtogeek.com)