About the Time Correction

Basic Operation

BAND		Rotary encoder

T.CORR

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 DVA-7996 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 11.

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DVA-7996 specifications

The Alpine DVA-7996 is a remarkable mobile multimedia receiver designed to elevate the in-car entertainment experience. With its robust set of features and advanced technologies, it caters to both audiophiles and casual listeners alike.

One of the standout aspects of the DVA-7996 is its impressive 7-inch touchscreen display. With high resolution and vibrant colors, the screen offers excellent visibility in various lighting conditions. The touchscreen interface is intuitive, making it user-friendly for both drivers and passengers. The customizable user interface allows users to personalize their experience, adjusting backgrounds and icons to suit individual preferences.

The DVA-7996 embraces the latest in connectivity, featuring built-in Bluetooth technology. This enables seamless audio streaming from compatible devices, hands-free calling, and easy access to voice command features. Additionally, it supports a broad range of media formats, including MP3, WMA, AAC, FLAC, and more, ensuring that users can enjoy their favorite tracks in various ways.

In terms of radio capabilities, the DVA-7996 offers AM/FM tuning with a high-quality digital signal processor (DSP) that enhances sound quality and allows for better reception. Users can store their favorite stations easily, thanks to the generous preset capabilities.

Another key highlight of the DVA-7996 is its compatibility with various media sources. It features a front USB port, making it easy to connect flash drives for direct playback, as well as a dedicated auxiliary input for additional devices. For users who enjoy using smartphones, the unit is compatible with Apple CarPlay and Android Auto, which provide a seamless integration of mobile apps right on the receiver's display.

Sound quality is paramount in the DVA-7996, which is evident through its comprehensive equalizer and crossover settings. With multiple channels and customizable options, users can tailor the audio output to suit their preferences, ensuring a finely tuned listening experience.

Safety and convenience features are also a significant part of the DVA-7996 package. It includes a rear-view camera input, which enhances visibility while reversing, and customizable steering wheel control integration, allowing users to operate the unit without taking their hands off the wheel.

Overall, the Alpine DVA-7996 stands out in the competitive automotive audio market, combining style, advanced technology, and exceptional sound quality to provide a superior user experience. Whether you’re a music enthusiast or simply looking for an upgrade to your vehicle's infotainment system, the DVA-7996 is a compelling choice.