Alpine CDA-W560E About the Time Correction, Example 1. Listening Position Front Left Seat

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About the 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-W560EX 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.

 

5.1ms

0.5m

 

2.25m

 

∗1

∗1

Tips

*1 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 23.

Here we calculate the time correction value for the front left speaker in the diagram at the left.

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*2 ⋅ 1000 = 5.1 (ms)

*2 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 the distance to the front left speaker 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 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.

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.

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Contents CDA-W560E CDA-W560EG Alpine CD Changers Give You More CHA-S634 CHA-1214 CHM-S630Contents Operating Instructions Excessively Thin Tape Correct Handling Turning Power On and Off Basic OperationInitial System Start-Up Audio Mute FunctionAbout Setup Press FUNCTION/SETUP to select Setup modeCD-DA ONLY/CD-DA CD Operation Scanning ProgrammesPlayback CD X. Random PlayRepeat Play Searching from CD TextQuick Search MP3/WMA Operation Playing MP3/WMA FilesSelecting Folders File/Folder Search44.1kHZ Playing MP3/WMA DataCD-DA only CD-DA & MP3/WMA Press / or to select the M.I.X. mode, then press ENT Press / or to select the Repeat mode, then press -/J / ENTPress / or to select the RPT mode, then press ENT RPT ONE RPT Fldr RPT ALL* RPT OFFAbout MP3/WMA Terminology Cassette Player Operation Playback CassetteManual Reverse Dolby B NR Noise ReductionTo cancel, select Repeat OFF with the above procedure To cancel, select B.SKIP OFF with the above procedureBlank Skip B.SKIP Programme Sensor P.SAutomatic Memory of Station Presets Listening to RadioMemo A-MEMO Tuning to Preset Stations CD Changer Operation OptionalStation Title Search Function Controlling CD ChangerAbout Indicator Display Title/Text OperationDisplaying the Title/Text Press TitleScroll Setting Titling Discs/StationsErasing Disc Title/Station Title Scroll Auto Scroll ManualSound Setting Setting the MX ModeAdjusting the HPF/LPF LPF Setting the Low Pass FilterAdjusting and Storing the Equalizer Curve Storing Adjustment ContentsRecalling the Equalizer Curve About the Time Correction Example 1. Listening Position Front Left SeatExample 2. Listening Position All Seats Tips Subwoofer speakerSetting the Bass Focus Example of Steps 3 and 4 SettingPress Audio Tune and return to the normal mode Time Correction Adjustment and Storage/ Calling Storing the Adjustment ContentsCalling the Stored Time Correction Value Setting Time Other FunctionsDisplaying Time Sound Guide FunctionSwitching the Tuner Mode Adjusting Display ContrastDimmer Control Demonstration FunctionSetting the AUX Mode V-Link Setting Tone Defeat for External DevicesTurning Mute Mode On/Off Subwoofer On and OffInformation Case of DifficultyBasic RadioCassette Indication for CD Head UnitIndication for CD Changer Tape playback sounds dullInstallation and Connections USE only in Cars with a 12 Volt Negative GroundInstallation InstallationIgnition Battery ConnectionsAerial Receptacle Power Aerial Lead Blue To prevent external noise from entering the audio systemSpecifications
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