For setting another channel (speaker), repeat the steps 2 and 3.

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.

Bass Focus

The time difference between the front-rear/left-right speakers, can be adjusted at the same time. With an initial delay of 0.1 ms for each of the 0 to 99 steps, audible time correction can be done.

1 Press the T.CORR button to select the Bass Focus mode.

→Bass Focus mode → Time correction mode

Normal mode ←

2 Press the BAND button to select the front-rear / left- right speakers.

FL

FR

FL

FR

→ RL

RR

→ RL

RR

Front (left-right)

Left (front-rear)

speakers

 

speakers

 

FL

FR ←

FL

FR ←

RL

RR

RL

RR

Rear (left-right)

Right (front-rear)

speakers

 

speakers

 

3 Turn the Rotary encoder to adjust the front-rear / left- right delay.

4

5 After setting, press and hold the T.CORR button for least 3 seconds to return to the normal mode.

NOTES

•Any manual time correction adjustments will also affect corrections made in Bass Focus.

•Bass Focus mode is automatically canceled if no buttons are pressed within 15 seconds.

Continued

11-EN

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Alpine CDA-7998 owner manual Bass Focus, Example 2. Listening Position All Seats, Front left-right Left front-rear Speakers
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CDA-7998 specifications

The Alpine CDA-7998 is a high-performance car audio receiver renowned for its advanced features and superior sound quality. Designed for audiophiles and car enthusiasts alike, this model combines cutting-edge technology with a user-friendly interface to enhance the in-car listening experience.

One of the standout features of the CDA-7998 is its exceptional audio quality. The receiver is equipped with a 24-bit digital-to-analog converter (DAC), which processes sound with unparalleled precision, reducing distortion and increasing clarity. This technology allows users to enjoy their favorite music with exceptional accuracy, making every note and tone come alive.

Another remarkable aspect of the CDA-7998 is its versatile connectivity options. The unit includes a front USB input, enabling easy connection to various devices, such as flash drives or smartphones. Additionally, it incorporates a 3.5 mm auxiliary input for added flexibility, allowing users to connect external devices with ease. The receiver supports playback of various audio formats, including MP3, WMA, and AAC, providing users with a vast library of music to choose from.

The CDA-7998 also features Bluetooth technology, which allows for hands-free calling and wireless audio streaming. This is particularly beneficial for maintaining focus on the road while enjoying a seamless connection to mobile devices. The built-in microphone ensures clear communication during calls, while the audio streaming feature allows users to enjoy their playlist without the hassle of cables.

Customization is a key aspect of the CDA-7998. The receiver includes a 3-band parametric equalizer, enabling users to adjust bass, midrange, and treble frequencies according to their preferences. Additionally, with its customizable color display and button illumination, users can personalize the aesthetic of their car’s interior, enhancing the overall experience.

Furthermore, the CDA-7998 supports additional amplification with its dedicated line outputs for front, rear, and subwoofer channels. This allows for a multi-channel audio setup, delivering an immersive sound experience that can satisfy even the most discerning listeners.

Overall, the Alpine CDA-7998 is a sophisticated car audio receiver that combines advanced technology with unparalleled sound quality and customization options, making it an ideal choice for anyone looking to elevate their in-car audio experience.
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