Alpine CDA-9887R Datasheet download pdf (Page 22)

20-EN

01GB05CDA-9887R.fm

ALPINE CDA-9887R 68-08564Z21-A (EN)

Turn the Rotary encoder to adjust the output level.

Adjustable output level: -12 to 0 dB.

Repeat steps 3 to 6 to make adjustment to the other

bands.

• While adjusting the X-over, you should consider the frequency

response of the connected speakers.

• The stored contents are not deleted even when resetting the unit or

disconnecting the battery.

• The stored contents can be recalled by performing operation in

“Recalling the Stored Crossover Settings” (page 20).

• Pressing AUDIO/RTN when X-over is adjusted will return to the

previous item.

• If MultEQ is turned on, the A.SEL button is ineffective. For details,

refer to “Turning MultEQ on/off” (page 16).

• About the 4.2ch (F/R/Sub-W) / 2.2ch (3WAY) system

You can switch to 4.2ch (F/R/Sub-W) / 2.2ch (3WAY) system mode

with the 4.2ch (F/R/Sub-W) / 2.2ch (3WAY) switch on the bottom side

of the unit (pages 40 to 42).

Recalling the Stored Crossover Settings

Press A.SEL to recall the DSP adjust mode.

Media Xpander Crossover T.Correction

Parametric EQ / Graphic EQ Media Xpander

Turn the Rotary encoder to select the Crossover

mode, and then press //ENT.

Press any one of the preset buttons (1 through

6) that has your desired characteristic in memory.

Press the preset buttons again to return to the

DSP adjust mode.

Press and hold /ESC for at least 2 seconds to

return to normal mode.

• Pressing AUDIO/RTN during the procedure will return to the

previous mode.

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, this unit 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 3.4 cm steps.

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*

× 1,000 = 5.1 (ms)

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.

Adjust the time correction level of each speaker to almost the same

level.

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.

When setting to “3WAY”:

The unit can be operated in a 2.2ch system.

When setting to “F/R/Sub-W”:

The unit can be operated in a 4.2ch system.

F/R Sub-W

3WAY

Example 1. Listening Position: Front Left Seat

Example 2. Listening Position: All Seats

2.25m

0.5m

5.1ms

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Alpine CDA-9887R Datasheet Page 22

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