Alpine IVA-D310R Owner's Manual download pdf (Page 41)

40-EN

01GB06IVA310R.fm

ALPINE IVA-D310R 68-02278Z24-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-D310R/IVA-D310RB 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 42.

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 40).

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

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Alpine IVA-D310R Owner's Manual Page 41

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