About the Time Correction

NOTES

•If no buttons are pressed within 5 seconds, the setup menu returns to the normal audio display.

•These functions are inoperative when an external, Ai-NET processor is connected.

•If HPF, LPF, Bass Control and Treble Control are all set to ON, depending on the Bass Control and Treble Control settings, you may not be able to reinforce the sound effect.

•Except when the HPF and LPF is turned OFF, the subwoofer is in monaural mode.

•When the subwoofer is set to OFF, LPF mode and change of phase does not work.

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-7892E 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
∗	∗

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* ⋅ 1000 = 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 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.

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 8.

7-EN

CDA-7892E specifications

The Alpine CDA-7892E is a high-performance car audio receiver known for its impressive sound quality and advanced features designed for audiophiles and casual listeners alike. One of its standout attributes is its compatibility with various audio formats, including MP3, WMA, and AAC. This versatility allows users to enjoy a diverse range of music files, ensuring that their favorite tracks sound great regardless of the format.

One of the main features of the CDA-7892E is its customizable audio settings. With a built-in 3-band parametric equalizer, users can adjust the sound to their preference, emphasizing certain frequencies to achieve a more personalized audio experience. Additionally, the receiver features advanced high and low pass filters, enabling users to optimize their speaker setup. This level of customization is ideal for those who value sound quality and wish to tailor their listening environment.

Another notable characteristic of the CDA-7892E is its robust connectivity options. The unit is equipped with a front-panel USB input, allowing direct connection to USB storage devices for easy playback of digital music files. Furthermore, it comes with an auxiliary input to connect external devices easily, such as smartphones or portable music players, giving users flexibility in their audio sources.

In terms of display, the CDA-7892E features a bright, easy-to-read LCD screen that provides essential information such as track details, volume level, and equalizer settings. The illumination options allow users to customize the display to match their vehicle's interior, enhancing the visual appeal of their dash.

For those who enjoy radio, the Alpine CDA-7892E delivers excellent AM/FM performance, complete with RDS functionality, which provides real-time information such as song titles and artist names. The unit is also equipped with preset options, allowing users to save their favorite stations for quick access.

Built with quality components and a robust design, the CDA-7892E is engineered to deliver reliable performance over extended use. Its sleek styling and ergonomic controls enhance usability, ensuring that drivers can operate the receiver safely while on the road.

Overall, the Alpine CDA-7892E stands out as a sophisticated car audio solution, merging advanced features, customizable options, and excellent connectivity to create a truly enjoyable listening experience for any music lover. Whether driving on a long journey or commuting short distances, this receiver ensures that high-quality sound is always within reach.

Alpine CDA-7892E About the Time Correction, Example 1. Listening Position Front Left Seat

Models: CDA-7892E