Alpine CDA-7969 Adjusting the Time Correction, Example 1. Listening Position Front Left Seat

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Basic Operation

Digital Time Correction

Preset buttons (F1 through F6)

DN g fUP F

Adjusting the Time Correction

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-7969/CDA-7867 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.

0.5 m

5.1 (ms)

(19-11/16")

 

2.25 m

(88-9/16")

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

Conditions:

Farthest Speaker – listening position: 2.25 m (88-9/16")

Front right tweeter – listening postion: 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

In other words, giving the front right tweeter a time correction value of 5.1 ms makes it seem as if the distance to the front right tweeter 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 right speaker and the rear left speaker is 1.75 m (68-7/8").

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Time correction eliminates the differences in the time required for the sound to reach the listening position.

The time of the front right 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 Divid 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.

4 Press the Digital Time Correction button for at least 2 seconds to switch to the Time Correction adjusting mode.

5 Select a speaker to be adjusted by pressing the Preset buttons (F1 through F6) button within 10 seconds of step 1.

F1: F/L (Front Left Speaker)

F2: F/R (Front Right Speaker)

F3: R/L (Rear Left Speaker)

F4: R/R (Rear Right Speaker)

F5: S/L (Subwoofer Left)

F6: S/R (Subwoofer Right)

6 Adjust the time correction value by pressing the DN gbutton or the fUP button within 10 seconds of step 5.

To adjust the time correction value for other speaker, repeat the steps 5 and 6.

NOTE

Up to 6 time correction settings can be stored in the available Presets.

Refer to "Memorizing the Time Correction Setting" on page 13.

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Contents CDA-7969 CDA-7867 Alpine CD Changers Give You More Contents Precautions Never Attempt the Following Basic Operation Audio Mute Function Setting TimeDisplaying Time Subwoofer On and Off Changing Lighting ColorDimmer Control CD Text Scroll Setting Turning Mute Mode On/OffSound Beep Guide Function Demonstration Demo OFFBlackout Mode On and Off Adjusting the built-in Audio ProcessorSwitching the Display Modes Displaying the Title/Text About Title and TextTitling Discs/Stations Selecting DHE Mode Equalizer PresetsMemorizing the Time Correction Setting Adjusting the Equalizer SettingsRecalling the Memorized Time Correction Setting Adjusting the Time Correction Time CorrectionExample 1. Listening Position Front Left Seat Example 2. Listening Position All SeatsAutomatic Seek Tuning Manual TuningRadio Operation Automatic Memory of Station Presets Manual Storing of Station PresetsTuning to Preset Stations Storing into Direct Access Preset D.A.P. BandMono/Stereo Switching Opening and Closing the Movable display CD Player OperationPlayback Music Sensor Skip Fast Forward and BackwardRepeat Play X. Random PlayWhen a 12-disc CD Changer is connected Controlling CD Changer OptionalMulti-Changer Selection Controls on Remote Control Remote Control Operation→ FM1 → FM2 → AM Volume Adjustment Buttons Battery Replacement Information Case of DifficultySpecifications HIGH-TEMPInstallation and Connections PrecautionsInstallation RemovalConnections 001-00ATAntenna Receptacle Power Antenna Lead Blue To prevent external noise from entering the audio system30-EN

CDA-7969, CDA-7867 specifications

The Alpine CDA-7867 and CDA-7969 are two notable car audio receivers that have gained recognition among enthusiasts for their advanced features, user-friendly interfaces, and superior sound quality. Both models showcase Alpine's commitment to delivering high-performance audio solutions for automotive environments.

The Alpine CDA-7867 stands out with its sleek design and a vibrant, illuminated display. It supports MP3/WMA playback, allowing users to enjoy their favorite digital music files with ease. The device comes equipped with a built-in 24-bit Digital-to-Analog Converter (DAC), which enhances sound clarity and detail. An integrated 4-channel amplifier powers up to 50 watts per channel, ensuring a robust audio experience. The CDA-7867 also supports CD playback, providing versatility for users who still enjoy traditional media. Its customizable equalizer features multiple preset options and a 3-band parametric EQ, enabling users to tailor the sound profile to their preferences.

On the other hand, the Alpine CDA-7969 boasts advanced features that cater to tech-savvy users. It includes a detachable faceplate for additional security, making it an attractive option for those concerned about theft. This model is also equipped with a progressive scan CD mechanism, resulting in seamless playback and improved disc handling. The CDA-7969 offers Bluetooth compatibility, allowing for hands-free calling and wireless music streaming from smartphones. Furthermore, it features a comprehensive set of inputs, including USB ports and auxiliary inputs, expanding the connectivity for various audio sources.

Both models utilize Alpine's proprietary sound processing technologies, which optimize acoustic performance for enhanced listening experiences. The dedicated subwoofer output available in both units allows for the easy integration of subwoofers, amplifying low-frequency sounds and producing a fuller audio spectrum.

In summary, the Alpine CDA-7867 and CDA-7969 are excellent choices for those seeking high-quality car audio systems. With their blend of traditional and modern technologies, these receivers cater to a wide range of audio preferences, ensuring that users can enjoy their favorite music with exceptional clarity and power. Whether selecting the CDA-7867 for its straightforward functionality or the CDA-7969 for its advanced features, both models are designed to elevate the in-car audio experience to new heights.
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