Alpine INE-W940 Owner's Manual - Audio (english) - Page 38

Rear Speaker Setting You can set the rear speaker output to "Off." Setting item: Rear Speaker Setting contents: On (Initial setting) / Off • Note that if you select "Off" when the Rear Speaker Position in Car Specific Sound Setup is set to "Rear Deck" or "Rear Door/Panel," the setting in Car Specific Sound Setup will be canceled. Turning Subwoofer ON/OFF If an optional subwoofer is connected to the unit, make the following setting. Setting item: Subwoofer Setting contents: On / Off (Initial setting) • Note that if you select "Off" when Subwoofer Installed in Car Specific Sound Setup is set to "Yes," the setting in Car Specific Sound Setup will be canceled. About Time Correction The distance between the listener and the speakers in a car vary widely due to the complex speaker placement. 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, this unit 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 3.4cm steps. 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. Setting Defeat [Defeat] is selected on the Sound setup menu in step 3. Refer to "Sound Setup Operation" (page 34). If Defeat is "On," MX, Factory's EQ and Parametric EQ functions are turned OFF. This disables any settings made for these functions. Setting item: Defeat Setting content: Off (Initial setting) / On 0.5m 2.25m 5.1ms 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"). Here we calculate the time correction value for the front left speaker in the diagram on the above. 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*1 × 1000 = 5.1 (ms) *1 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 its distance from the listener is the same as the distance to the farthest speaker. 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 correction value to the farthest speaker and the other speakers. L = (distance to farthest speaker) - (distance to other speakers) 38-EN