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01GB06IVA310.fm
ALPINE IVA-D310 68-02278Z28-A (EN)
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 left ear.
To correct this, the IVA-D310 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
* 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.
For details, refer to the “Tips” on page 41.
Here we calculate the time correction value for the front left
speaker in the diagram 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** × 1000 = 5.1 (ms)
** Speed of sound: 343 m/s (765 mph) at 20°C
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.
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.
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.
Before performing the following procedures, refer to “About the Time
Correction” (page 39).
Setting item: T.CORR (TIME CORRECTION)
Setting contents: 0.0 - 9.9
1 Touch [] of T.CORR.
The screen changes to the T-CORR. setup screen.
2 Touch [] or [] of the desired speaker to adjust the time
correction value (0.0 to 9.9).
3 Repeat Step 2 above to set another speaker.
4 Touch [RETURN] to return to the previous screen.
• The setting contents which have been set in “Time Correction” are
applied for the Bass Focus mode.
• The time correction adjusting function can be applied for Pre-out
output.
Storing the Adjusted Contents
The storing/recalling of time correction operation is performed after
Step 4 above.
5 Touch [MEMORY] on the BASS ENGINE screen.
6 Within 5 seconds, touch any one of preset buttons
[P.SET 1] through [P.SET 6].
The adjusted contents will be stored on the preset
number you touch.
• The stored contents on the P.SET number remain undeleted despite a
reset operation or disconnection of the battery power cord.
• Adjusted/set contents of each setting item in Bass Engine can be
stored in the preset buttons (1 through 6).
Recalling the Stored Time Correction Setting
The storing/recalling of time correction operation is performed after
Step 4 above.
5 Touch any one of [P.SET 1] to [P.SET 6] on the BASS
ENGINE screen.
The stored adjusting contents will be recalled.
About the Time Correction
2.25m
0.5m
∗
5.1ms
∗
Adjustment and Storing/Recalling of Time
Correction
01GB00IVAD310.book Page 39 Wednesday, December 1, 2004 4:20 AM