Alpine PXA-H800 Owners Manual - Page 29

From a PC Displaying the data 1 Click [Show All Data] . The setup values for all the channels will be displayed. Concrete examples 1 Calculating the time correction value for the front left speaker on the diagram below. Conditions: Distance between farthest speaker and listening position: 2.25 m {88-3/4") Distance between front left speaker and listening position: 0.5 m (20") Calculation: L = 2.25 m (88-3/4")- 0.5 m (20") = 1.75 m (68-3/4") Compensation time = 1.75 .;. 343 x 1000 = 5.1 (ms) In other words, setting the time correction value for the front left speaker to 5.1 (ms) sets a virtual distance matching the distance to the farthest speaker. Adjusting the Time Correction (TCR) Because of the particular conditions inside the vehicle, there are major differences in the distances between the different speakers and the various listening positions. The proper time correction can be obtained using the automatic time correction function ("Auto TCR"), but it is also possible to calculate the optimum correction val ues and eliminate the time error at the listening position using this function. The unit for the time correction can be chosen to be either "em" or "inch." (Initial setting: "em") • Calculation of time correction 1 Sit in the listening position (the driver's seat, for example) and measure the distance (in meters) between your head and the various speakers. 2 Calculate the difference in distance between the farthest speaker and the other speakers. L =(distance of farthest speaker)- (distance of other speakers) 3 Divide the distances calculated for the different speakers by the speed of sound (343 m/s temperature 20°C). This value is the time co rrection value for the d ifferent speakers. The sound is uneven because the distance between the listening position and the different speakers is different. The difference in the distance between the front left and rear right speakers is 1. 75 meters (68-3/4"). Time correction eliminates the difference between the time required for the sound from the different speakers to reach the listening position. Setting the time correction of the front left speaker to 5.1 ms makes it possible to coordinate the distance from the listening position to the speaker. • Entering the time correction 4 Click [TCR] for [Shortcut] tab in the main menu. The TCR Setup screen is displayed. • When you click [Mobile Sound Manager] on the Function switching tab, and then [TCR], the TCR Setup screen will also be displayed. Refer to "Operating the Function Switching Tab" (page 7). 5 Click [ON] for "TCR" in the main menu. • Choose OFF to disable the TCRfunction. 6 Click either [B; ] or [IIJ]. I I :Both R and L channels are set at the same value (The initial setting). IIJ :Channels R and L can be set independently. "I!J," • When you select a message to confirm which of the R or L channel set up values is to be applied will be displayed. Click either {LEFT] or [RIGHT]. 28-EN