Editing Precedence effect (section)

===Sound reinforcement systems===
Haas's findings can be applied to [[sound reinforcement system]]s and [[public address]] systems. The signal for loudspeakers placed at distant locations from a stage may be [[Delay (audio effect)#Straight delay|delayed electronically]] by an amount equal to [[speed of sound|the time sound takes to travel through the air]] from the stage to the distant location, plus about 10 to 20 milliseconds, and played at a level up to 10&nbsp;dB louder than the sound reaching this location directly from the stage. The first arrival of sound from the source on stage determines perceived localization whereas the slightly later sound from delayed loudspeakers simply increases the perceived sound level without negatively affecting localization. In this configuration, the listener will localize all sound from the direction of the direct sound, but they will benefit from the higher sound level, which has been enhanced by the loudspeakers.<ref>{{cite web|url=http://www.nti-audio.com/Portals/0/data/en/NTi-Audio-QuickGuide-FOH.pdf|title=How To Setup for a Live Sound Event|first=NTi|author-link=NTi Audio|last=Audio|website=www.nti-audio.com}}</ref>