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Text excerpt from page 22 (click to view)
Recalling the Stored Crossover Settings
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)
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Press and hold MENU for at least 2 seconds. Select the Crossover (X-OVER) mode by sliding your finger on the GlideTouch bar to the left or right. Press the GlideTouch bar under the Crossover (X-OVER) mode.
*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.
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Press FUNC. or the GlideTouch bar to activate the preset mode. Select any one of the preset numbers (1 through 6) by sliding your finger on the GlideTouch bar to the left or right. Press the GlideTouch bar under the desired preset to recall the stored contents. Press and hold MENU for at least 2 seconds to return to normal mode.
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.
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Example 2. Listening Position: All Seats
Adjust the time correction level of each speaker to almost the same level.
� If MENU is pressed while adjusting or setting items in the MENU mode, the unit will return to the previous selection screen. � By pressing the GlideTouch bar under RETURN in the MENU mode, the unit returns to the normal mode.
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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-9855R/CDA-9853R 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.
Sit in the listening position (driver�s seat, etc.) and measure the distance (in meters) between your head and the various speakers. Calculate the difference between the distance to the farthest speaker and the other speakers.
L = (distance to farthest speaker) � (distance to other speakers)
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.
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.
5.1ms
0.5m 2.25m
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").
