Alpine INA-W910 - Manual (Page 79)

79
-EN
Pro Logic processing can be conducted on the music signals recorded
on two channels to achieve Dolby Pro Logic II surround sound. For
two-channel Dolby Digital and DTS signals, there is also a “Rear Fill”
function for outputting the signals of the front channel to the rear
channel.
Setting items: Dolby PLII / Rear Fill
Touch [ ] or [ ] of Dolby PLII / Rear to select the
desired mode.
If PL II Music is selected, the center width can be adjusted with
following operations.
This function offers the optimum vocal position by adjusting the
center channel position between the center speaker and the L/R
speaker. (The adjustments established in “Adjusting the
acoustic image (Bi-Phantom)” (page 81) are ineffective while
this function is activated.)
Touch [ ] or [ ] of Center Width Cont. to adjust
the level.
The level can be adjusted between 0 to +7. When the level
increases, the center channel position moves from the
center speaker position to both sides.
Touch [Off] of Center Width Cont. to turn off the center width
control.
• This adjustment is effective when the setting of the center speaker is
Small or Large in the Speaker Setup (page 82).
• “Rear Fill” function:
Depending on the input signals, the sound may only be output from
the front speakers. In this case, the “Rear Fill” function can be used
to output signals from the rear speakers as well.
• Avoid stopping, pausing, switching the disc, cueing, fast-forwarding
or switching the audio channel of this unit while making this
adjustment. The setting is canceled if the Decode mode is switched.
• This adjustment is ineffective when the speaker is set Center to OFF
in “Setting the Speakers” (page 81).
• This function only works with two-channel signals. This operation is
ineffective when 5.1-channel DTS or Dolby Digital signals are input.
• If the setting of Rear Fill is made when Rear Mix is ON, sound is
unchanged in the Rear Fill setting because Rear Mix is given priority
during 2 channel decoder other than linear PCM.
• For linear PCM signals, the voice is output from the rear speaker
regardless of the Rear Fill and Rear Mix setting.
Setting item: X-Over
1
Touch [ ] or [ ] of X-Over to select L+R or L/R.
2
Touch the title bar of X-Over.
A speaker list on the X-Over screen is displayed.
3
Touch the title bar of the speaker to be adjusted.
The screen changes to the X-Over screen to be adjusted.
4
Adjust the crossover to your preference.
Selecting the Cut-Off Frequency
Touch [ ] or [ ] of Freq., then select the cut-off frequency
(crossover point).
The adjustable bandwidth differs depending on the speaker
(channel).
Adjusting the Level
Touch [ ] or [ ] of Level, then adjust the HPF or LPF level.
Adjusting the Slope
Touch [ ] or [ ] of Slope, then adjust the HPF or LPF slope.
• When the speaker is set to the “OFF” mode, the X-Over for that
speaker cannot be set. Refer to “Setting the Speakers” (page 81).
• 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).
• The HPF cannot be set Slope to OFF if Tweeter (TW) is selected for
Front1. Or, only the subwoofer is adjustable if Stereo is selected for
the subwoofer.
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.
Setting item: 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 various
speakers.
Using the Pro Logic II Mode
PL II Movie: Suits the stereo TV shows and all programs
encoded in Dolby Surround. It improves the
sound field directivity to near that of discrete
5.1-channel sound.
PL II Music: Can be used for all stereo music recordings, and
provides a wide, deep sound field.
OFF: Turns Dolby PL II function to OFF.
X-OVER Adjustment
L+R: Sets the same adjustment values for the left and
right channels.
L/R: Different adjustment values can be set for the left
and right channels.
Performing Time Correction Manually
(Time Correction)