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

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Outputs all frequencies lower than that selected

according to your preference.

(Only available when using the subwoofer output from this unit.)

NOTES

•If you turn the battery power OFF, all settings return to factory default.

•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.

•If no buttons are pressed within 15 seconds, the display for setup menu disappears while an ordinary menu appears on the display.

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 CDM-7892R 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.

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

0.5m

5.1ms

* 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.

2.25m

∗

∗

7-EN

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Contents CDM-7892R CHA-S634 CHA-1214 CHM-S630Contents Precautions Handling the Detachable Front Panel Detaching the Front Panel Basic OperationsAttaching the Front Panel Initial System Start-UpDisplay Angle Adjustment Turning Power On and OffAudio Mute Function Changing the Audio Level DisplaySetting the Treble Control Setting the Bass ControlAdjusting the built-in Crossover Basic OperationAbout the Time Correction Example 1. Listening Position Front Left SeatExample 2. Listening Position All Seats Bass Focus Example of Steps 2 and 3 SettingSetting the MX Mode Time CorrectionTime Difference Table Automatic Seek Tuning Manual TuningManual Storing of Station Presets Radio OperationsTuning to Preset Stations Automatic Memory of Station PresetsRecalling Preset RDS Stations Setting RDS Reception Mode and Receiving RDS StationsRDS Operations Receiving RDS Regional Local StationsReceiving Traffic Information PTY Programme Type TuningWhen traffic information stations cannot be received Receiving Traffic Information While Playing CD or RadioPriority News CD Player Operation Opening and Closing the Movable displayPlayback Music Sensor Skip X. Random PlayFast Forward and Backward Repeat PlayAdjusting Source Signal Levels Setup OperationSwitching the Tuner Mode Setting Frequency StepDemonstration Setting the AUX ModeCase of Difficulty InformationNo Magzn FM Tuner Section General SpecificationsPrecautions Installation and ConnectionsRemoval Installation24-EN ConnectionTo prevent external noise from entering the audio system Audio Interrupt In Lead Pink/BlackPage Händlerstemple GERÄTE-PASS

CDM-7892R specifications

The Alpine CDM-7892R is a high-performance car audio receiver that exemplifies modern technology and sound quality for audiophiles and casual listeners alike. As part of Alpine's renowned lineup, this model is designed to enhance the in-car listening experience with a blend of innovative features, connectivity options, and superior audio processing capabilities.

One of the standout features of the Alpine CDM-7892R is its ability to support various media formats, allowing users to enjoy their favorite tracks from CDs, MP3s, and even USB drives. The diverse playback options ensure that drivers can have their music library at their fingertips, providing an enjoyable experience on every journey. The front USB port also allows for convenient connection to digital devices, making it easy to play high-quality audio files directly from smartphones or USB flash drives.

A key highlight of the CDM-7892R is its built-in 24-bit DAC (Digital-to-Analog Converter) which significantly enhances audio fidelity. This technology ensures that even lossy audio formats sound smooth and rich, rejuvenating the listening experience with clarity and depth that audiophiles crave. Coupled with an advanced equalizer, users can fine-tune their sound preferences to achieve the perfect audio balance tailored to their taste.

For those who value connectivity, the Alpine CDM-7892R supports Bluetooth technology, enabling hands-free calling and wireless music streaming from compatible devices. This feature not only adds convenience but also promotes safe driving by allowing users to focus on the road while managing calls and playlists effortlessly.

The receiver's sleek, user-friendly interface is another notable characteristic. Featuring a bright, easily readable display, it allows intuitive navigation through the menu options. The ergonomic rotary knob simplifies volume control and track selection, ensuring users can adjust settings without taking their eyes off the road.

In terms of expandability, the CDM-7892R includes preamp outputs for connecting external amplifiers and speakers, providing options for users looking to transform their in-car audio system into a full-fledged sound experience. The model also supports high-fidelity audio systems, enabling enthusiasts to build on their setups for even greater sound performance.

In summary, the Alpine CDM-7892R is a versatile and feature-rich car audio receiver that caters to music lovers' needs. With its support for various media formats, advanced audio technologies, convenient Bluetooth connectivity, and user-friendly interface, it stands out as a top choice for anyone looking to upgrade their car audio system while enjoying high-quality sound wherever the road takes them.
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