Zapco DC Intro - Manual (Page 18)

Signal Delay
 You ear determines the location of sounds by reading the differences in the
times a signal from a particular location reaches each ear.
 Ideally we want to sit in the center of the sound stage so we hear everything
in it’s very best environment.
 We can do this in a home system by sitting directly between the speakers
 In a car system we can not do this because we sit much closer to some
speakers than to others. In a car system, sound from the closer speaker will
arrive at out ears first and we can not feel like we are at “center Stage”.
 Signal Delay allows us to trick our ears into thinking we are at “center stage”
by delaying the sound from the closer speakers