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Here we calculate the time correction value for the front left
speaker in the diagram at the left.
Conditions:
Farthest Speaker – listening position: 2.25 m (88-9/16")
Front left speaker – listening position: 0.5 m (19-11/16")
Calculation: L = 2.25 m – 0.5 m = 1.75 m (68-7/8")
Time correction = 1.75 ÷ 343*
2
× 1000 = 5.1 (ms)
*
2
Speed of sound: 343 m/s (765 mph) at 20˚C
In other words, giving the front left speaker a time correction
value of 5.1 ms makes it seem as if the distance to the front left
speaker is the same as the distance to the farthest speaker.
The sound is not balanced because the distance between the
listening position and the various speakers is different.
The difference in distance between the front left speaker and
the rear right speaker is 1.75 m (68-7/8").
Time correction eliminates the differences in the time required
for the sound to reach the listening position.
The time of the front left speaker is corrected by 5.1 ms so that
its sound reaches the listening position at the same time as the
sound of other speakers.
Example 2. Listening Position: All Seats
Adjust the time correction level of each speaker to almost the
same level.
1
Sit in the listening position (driver’s seat, etc.) and
measure the distance (in meters) between your
head and the various speakers.
2
Calculate the difference between the distance to
the farthest speaker and the other speakers.
L = (distance to farthest speaker) – (distance to other
speakers)
3
Divide the distances calculated for the speakers by
the speed of sound (343 m/s (765 mph) at 20˚C).
These values are the time correction values for the
different speakers.
About the Time Correction
The distance between the listener and the speakers in a car
vary widely due to the special conditions of the mobile
environment. This difference in the distances from the
speakers to the listener creates a shift in the sounds image
and frequency characteristics. This is caused by the time
delay between the sound reaching the listener’s right versus
the left ear.
To correct this, the CDA-W560EX is able to delay the audio
signal to the speakers closest to the listener. This effectively
creates a perception of increased distance for those speakers.
The listener can be placed at an equal distance between the
left and right speakers for optimum staging.
The adjustment will be made for each speaker in a step of
0.1 ms.
Example 1. Listening Position: Front Left Seat
Adjust the time correction level of the front left speaker to a
high value and the rear right to zero or a low value.
Tips
*
1
Subwoofer speaker.
You cannot change the Time Correction value for the subwoofer,
but you can set the subwoofer's apparent position to the front by
adjusting the Time Correction value of the front and rear speakers.
Fo r details, refer to the "Tips" on page 23.
2.25m
0.5m
∗1
5.1ms
∗1