Eclipse - Fujitsu Ten CD5444 - Manual (Page 94)

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How to operate the Sound Adjustment Mode
With vehicle audio systems, the installation position of the
speakers and the position of the listener mean that the
distances from the listener to the left and right speakers are
almost always different. These differences in the distance from
the listener to each speaker in turn means that the time taken
for the sound to reach the listener is different for each speaker.
The result of this is that the phases of each speaker (biases)
become mismatched and the sound becomes unnatural, as
though the sound stage is not wide enough.
The "time alignment" function corrects the time taken for the
sound waves to reach the listener in order to set the optimum
phase for the listening position so that the sound becomes
more expansive as though it is being listened to on a sound
stage.
The basic adjustment method involves measuring the actual
distances to each speaker and calculating the differences in
distance relative to the most distant speaker in order to derive
the delay time for the sound from each speaker.
When this deck is in advance mode, a simplified time
alignment function is available. You can use this function to
adjust only four parameters (position selector, vehicle type,
tweeter settings and rear speaker position settings), and so
you can make basic time alignment settings without measuring
the actual distances to each speaker.
Time alignment