Alpine CDA-9887 Owners Manual - Page 19

6 Turn the Rotary encoder to adjust the output level. Adjustable output level: -12 to 0 dB. 7 Repeat steps 3 to 6 to make adjustment to the other bands. • While adjusting the X-over, you should consider the frequency response of the connected speakers. • The stored contents are not deleted even when resetting the unit or disconnecting the battery. • The stored contents can be recalled by performing operation in "Recalling the Stored Crossover Settings" (page 17). • Pressing /RTN when X-over is adjusted will return to the previous item. • If MultEQ is turned on, the A.SEL button is ineffective. For details, refer to "Turning MultEQ on/off " (page 13). • About the 4.2ch(F/R/Sub-W)/2.2ch(3WAY) system You can switch to 4.2ch( F/ R/ Sub-W )/ 2.2ch(3WAY) system mode with the 4.2ch(F/R/Sub-W)/2.2ch(3WAY) switch on the bottom side of the unit (pages 40 to 42). F/R Sub-W 3WAY When setting to "3WAY": The unit can be operated in a 2.2ch system. When setting to "F / R / S u b - W ": The unit can be operated in a 4.2ch system. Recalling the Stored Crossover Settings 1 Press A.SEL to recall the DSP adjust mode. Media Xpander Crossover T.Correction Parametric EQ/Graphic EQ Media Xpander 2 Turn the Rotary encoder to select the Crossover mode, and then press / /ENT. 3 Press any one of the preset buttons (1 through 6) that has your desired characteristic in memory. 4 Press the preset buttons again to return to the DSP adjust mode. 5 Press and hold /ESC for at least 2 seconds to return to normal mode. • Pressing /RTN during the procedure will return to the previous mode. 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. 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 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. 17-EN