Alpine PXA-H800 - Time Correction (TCR) Adjustment

From
e omman er
12
To
adjust another channel,
repeat Steps 5 through
11.
•
You
can mute the channel you are adjusting.
1 Press [MUTE] while in the adjustment
mode
to
mute
the
channel.
2
To
cancel
muting, press [MUTE] again.
13
When the setting is
complete,
press and
hold[~]
for at
least
2 seconds.
•
If
[
~
] is pressed during setting, the unit returns to the previous
item.
When Tweeter is selected
for
FRONT HIGH to protect the speaker.
there is
nofilterojf(Slope
OFF)
setting
for
HPF.
There is
nofilteroff
(Slope
OFF)
setting
for
Subwoofer
LPF,
either.
•
When the speaker is in
Off
mode,
X-Over
does not affect the speaker.
Refer to
"Setting
the Speaker System (System
Select)"
(page 37)1
"Setting
the Speakers (Speaker
Setup)" (page 38).
•
Check the playback frequencies
of
the connected speakers before
adjusting.
•
After the setting,
it
is recommended to store the setting contents on
the unit. For details, refer to
"Storing
the Preset
Values
(Preset
Store)" (page 36).
Adjusting
the
Time
Correction
(TCR)
Because
of
the particular conditions
in
side the vehicle, there are major
differences in the distances between the different speakers and the
listening position. 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 yourself using this function.
• 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
Ca
l
culat
i
ng
the time correction value for the front left
sp
ea
ker
on
the
diagram
below
.
Conditions:
Distan
ce
between farthest speaker and listening position: 2.
25
m
(88-3/4")
Distance between front left speaker and
li
stening 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)
50-EN
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.
The sound is uneven because
the distance between the
listening position and the
different speakers
is
different.
The difference
in
ihe distance
between
the
front left and rear
right speakers is 1.
75
meters
(68-3/4')
Time correction elimina
te
s the
difference between the time
required for
th
e 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 f
rom
the listening
positi
on
to the speaker.
•
Entering the time correction
4
Press [FUNC.].
5
Rotate the [Rotary encoder] to select "Sound Field
Adj.,"
and then press the [Rotary encoder].
6
Rotate the [Rotary encoder] to
select "TCR", and
then press the [Rotary encoder].
The
TCR
screen is
displayed
.
II"TCR
FRotH
HIGH
·.
. -
DD.DD
m!;
u n
(!IIJ
7
Select [ON]
for
"TCR"
by rotating the [Rotary
encoder], and press the [Rotary encoder].
• When
"
OFF"
is selected,
th
e TCRfunction becomes disabled.
8
Press and hold
[CHANNEL] for
at
least
2 seconds.
Rotate the [Rotary encoder]
to
select either
"L+R"
or
"L
or
R,"
and press the [Rotary encoder].
L
or
R:
Channels
R
and
L
ca
n
be
set independently.
L
+R
Both
Rand
L channels are set at the same value
(The initial settin
g)
.