CDA 9Z6 Owner's Manual download pdf (Page 16)

14-EN

Basic Operation

Preset buttons (F1 through F6)Digital Time Correction

Adjusting the Time Correction

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-7969/CDA-7867 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.

Here we calculate the time correction value for the front

right tweeter in the diagram at the left.

Conditions:

Farthest Speaker – listening position: 2.25 m (88-9/16")

Front right tweeter – listening postion: 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* × 1000 = 5.1 (ms)

*Speed of sound: 343 m/s (765 mph) at 20˚C

In other words, giving the front right tweeter a time

correction value of 5.1 ms makes it seem as if the distance

to the front right tweeter 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 right speaker

and the rear left speaker is 1.75 m (68-7/8").

f UPDN g

Time correction eliminates the differences in the time

required for the sound to reach the listening position.

The time of the front right 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 Divid 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.

4 Press the Digital Time Correction button for at

least 2 seconds to switch to the Time Correction

adjusting mode.

5 Select a speaker to be adjusted by pressing the

Preset buttons (F1 through F6) button within

10 seconds of step 1.

F1: F/L (Front Left Speaker)

F2: F/R (Front Right Speaker)

F3: R/L (Rear Left Speaker)

F4: R/R (Rear Right Speaker)

F5: S/L (Subwoofer Left)

F6: S/R (Subwoofer Right)

6 Adjust the time correction value by pressing the

DN g button or the f UP button within 10

seconds of step 5.

To adjust the time correction value for other

speaker, repeat the steps 5 and 6.

NOTE

Up to 6 time correction settings can be stored in the

available Presets.

Refer to "Memorizing the Time Correction Setting" on

page 13.

5.1 (ms)

0.5 m

(19-11/16")

2.25 m

(88-9/16")

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 31 32

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CDA 9Z6 Owner's Manual Page 16

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