Settings/Adjustments; Performing Time Correction Manually (Time Correction) - Alpine Multimedia Manager PXA-H900 Owner's Manual

Settings/Adjustments

Performing time correction
manually (Time Correction)
Though sufficient correction can be achieved with the "Adaptive
Equalizer" and "Precision Automated Time Correction" automatic
adjustments, it is also possible for the user to calculate the
correction values and make the adjustments manually. This
manual adjustment requires sufficient knowledge and experience,
however, so we suggest you have it performed at your store of
purchase.
1
Check that the defeat mode is off.
(See page 53.)
2
Sit in the listening position (the driver's seat, for
example) and measure the distance (in meters)
between your head and the various speakers.
3
Calculate the difference in distance between the
farthest speaker and the other speakers.
L = (distance of farthest speaker) –
(distance of other speakers)
4
Divide the distances calculated for the different
speakers by the speed of sound (340 m/s
temperature 14 C).
This value is the time correction value for the
different speakers.
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EN
• When the microphone is
connected, the sound in the car is
input through the microphone
and displayed on the spectrum
analyzer. This display can be
used as reference when making
the adjustment. For details of the
spectrum analyzer display, see
"Switching the display mode"
(page 53).
• This adjustment is easier when
test signals such as pink noise are
used. For information on test
signals, consult your store of
purchase.
• The speed of sound fluctuates
according to the temperature.
The accurate speed of sound can
be achieved with the formula
shown below.
Speed of sound =
331.45 + C x T
C: 0.607
T: Temperature ( C)