Alpine PXA-H800 - Manual (Page 30)

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01GB06PXAH800.fm
ALPINE PXA-H800_EN 68-13530Z65-A (B5)
From a PC
Displaying the data
1
Click [Show All Data].
The setup values for all the channels will be displayed.
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 values and eliminate the
time error at the listening position using this function.
The unit for the time correction can be chosen to be either “cm” or
“inch.” (Initial setting: “cm”)
e 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 correction value for the different
speakers.
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.
e 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 TCR function.
6
Click either [ ] or [ ].
: Both R and L channels are set at the same value (The
initial setting).
: Channels R and L can be set independently.
• 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].
2.25m
0.5m
5.1ms
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.
01GB00PXAH800.book Page 28 Tuesday, February 8, 2011 9:04 PM