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About Time Correction
The distance between the listener and the speakers in a car vary
widely due to the complex speaker placement. 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-9835/CDA-9833 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 0.1 ms steps.
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.
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").
Here we calculate the time correction value for the front left
speaker in the diagram on the above.
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*
1
× 1000 = 5.1 (ms)
*
1
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 its distance from the
listener is the same as the distance to the farthest speaker.
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.
2.25m
0.5m
5.1ms
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.
Bass Focus
The time difference between the front-rear/left-right speakers, can be
adjusted at the same time. With an initial delay of 0.1 ms for each of
the 0 to 99 steps, audible time correction can be done.
1
Press and hold MENU for at least 2 seconds.
2
Press MENU to select Bass Focus mode or Time
Correction mode.
3
Press g or f to select the Bass Focus mode.
Bass Focus mode ↔ Time Correction mode
4
Press BAND/TEL. to select the speakers to be
adjusted (see below).
5
Turn the Rotary encoder to adjust the delay (see
Time Difference Table).
6
To set another channel (speakers), repeat steps 4
and 5.
→
←←
→
Front (left-right)
speakers
Left (front-rear)
speakers
Rear (left-right)
speakers
Right (front-rear)
speakers
FL FR
RL RR
FL FR
RL RR
FL FR
RL RR
FL FR
RL RR
Continued