Performing Time Correction Manually (Tcr) - Alpine IVA-D310RB Owner's Manual

8
Adjust the crossover to your preference.
X-OVER (LPF) adjustment screen example
Displays the speaker (channel) currently selected
Displays the HP or LP selected
Displays the cut-off frequency currently selected
Displays the level of HPF or LPF currently selected
Displays the slope range of HPF or LPF currently
selected
Variable range of selected cut-off frequency
Displays the variable range of the cut-off frequency level
currently selected with an orange bar.
Selecting the Cut-Off Frequency
Touch [ ] or [ ], then select the cut-off frequency
(crossover point).
The adjustable bandwidth differs depending on the speaker
(channel).
Adjusting the Level
Touch [ ] or [ ], then adjust the HPF or LPF level.
Switching between HPF and LPF
HPF/LPF changes each time [HPF/LPF] is touched.
HPF: Outputs all frequencies higher than that selected
according to your preference.
LPF: Outputs all frequencies lower than that selected
according to your preference.
(Only available when using the subwoofer output from
this unit.)
Adjusting the Slope
Touch [SLOPE], then adjust the HPF or LPF slope.
Adjusting Level/Cut-off Frequency Directly
Touching the variable range of the level/cut-off frequency moves
the level/cut-off frequency to the touched position.
• If [CANCEL] is displayed while LOADING is touched, or an
operation is carried out on the connected audio processor, loading is
stopped and the setting contents (created before stopping) are
displayed.
• Loading time may take longer depending on the setting content. This
is not a malfunction.
9
Touch [RETURN] to return to the previous screen.
• When the speaker is set to the "OFF" mode, the X-OVER for that
speaker cannot be set. Refer to "Setting the Speakers" (page 47).
• Check the playback frequencies of the connected speakers before
adjusting.
• In order to protect the speakers, there is no OFF setting for the
subwoofer low pass filter (the slope remains the same).
48
-EN
• Even if Tweeter is selected for FRONT 1, the filter OFF (slope OFF)
of the H.P.F. can be set. If the slope is set to OFF, speakers may be
damaged. Take care with this setting.
• The H.P.F. filter cannot be set to OFF (slope OFF) if Tweeter is
selected for FRONT1 . Or, only the subwoofer is adjustable if
STEREO is selected for the subwoofer.
Performing Time Correction Manually
(TCR)
Because of the particular conditions inside the vehicle, there can be
major differences in the distances between the various speakers and the
listening position. It is possible to calculate the optimum correction
values and eliminate the time error at the listening position yourself
using this function.
1
Check that Defeat mode is off.
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 (343 m/s
temperature 20°C).
This value is the time correction value for the various
speakers.
Concrete examples
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.