Alpine IVA D106 Owner's Manual - Page 49

Setting the Response Slope for the High Range Speaker (TW Setup) Depending on the response characteristics of the speaker, care should be taken when setting the response slope of the high range speaker to FLAT in 2.2ch (3WAY) mode (see "X-OVER Adjustment" on page 51), as speaker damage may result. Setting item: TW SETUP Setting contents: MAKER / USER MAKER: As protection from possible speaker damage, FLAT cannot be set for the response slope of the high range speaker in 2.2ch (3WAY) mode. USER: The FLAT setting is possible in 2.2ch (3WAY) mode. • Only if the 3WAY (2.2CH) switch is toggled between FRONT/REAR/ SUBW. (4.2CH) and 3WAY (2.2CH) on the IMPRINT audio processor (PXA-H100), you can select the TW SETUP 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. Storing Settings in the Memory Adjustment or setting contents can be stored. Contents that can be stored vary depends on the IMPRINT audio processor used. 1 Touch [MEMORY] on the A.PROCESSOR list display. 2 Within 5 seconds, touch any one of the preset buttons [P.SET 1] through [P.SET 6] on the A.PROCESSOR list. The setting contents are stored. • The stored contents will not be deleted even when the battery power cord is detached. Recalling the Preset Memory Touch Preset buttons [P.SET 1] through [P.SET 6] on the A.PROCESSOR list to select the preset memory you want to recall from Preset buttons. • It takes a few moment to recall the preset memory. 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) 47-EN