ADVANCED MANUAL / Bit One /
41
Real distances
measured in
relation to the
listening point
In order for you to view how much the
“fine set”
has been
manually changed to see the resulting, actually applied to the
output, delay value, you have to calculate the algebraic sum
of the value shown in the
“DELAY / default”
and
“DELAY /
fineset”
boxes.
The negative value (decreasing the delay) can not be assigned
to the farthest speaker; it can only be assigned to the other
speakers as they are all already delayed compared to the
farthest one.
If you try and give a negative value to the farthest speaker, an
alert message will show
(Fig.2)
.
By acting on
“fine set”
, the word
“fds”
will light up on the
corresponding channel of the
“Channel Map”
(Fig.3)
.
EXAMPLE OF TIME DELAY SETTING (Fig.4):
1.
Choose the system listening point.
To identify the listening point, choose an ideal point located
at the centre of the listener’s (driver or passenger) head.
For the front central point and rear central point choose an
intermediate point between the two listeners.
2.
Measure the distance between each loudspeaker or
group of loudspeakers and the listening point in a straight
line (“as the crow flies”).
For each loudspeaker choose the centre of the mobile
membrane as the emission point.
For the groups of loudspeakers choose an intermediate
point between them. Then, it will be possible to perform the
fine tuning by selecting the
Fine Set
function.
3.
Select the channel related to the loudspeaker under exam
on the
Channel Map
and enter the respective distance
value on the
Set Distance
box from the
Filter Setting
menu.
4.
Repeat step 3 for each channel.
5.
Perform all the time delays settings, start the music
reproduction and select the
Fine Set
box.
If you move the values in positive or negative (except for
the subwoofer in Fig.4 it is the farthest speaker), you can
find the best time alignment that will ensure a correct
acoustic scene.
It is advisable to listen to different types of musical tracks
(percussions, melodic etc.) for a much more correct
evaluation of the different musical instruments coherency
(space stability).
6.
Once the time alignment procedure is completed, you
can operate on the output equalizer (Master).
You can refer to
section 9.12
to optimize the system
response in accordance with the level alignment to the
different frequencies.
Remark:
the measurements for the above operations can also
be taken by using a spectrum analyser featuring an appropriate
microphone. The result must be assessed with final refining
listening tests.
WARNING:
if, once you have set the distances comparing to the “driver” listening
point you click on the “passenger” listening point, the Bit One won’t re-calculate
the delays compared to the new reference point because the buttons available
in the SELECT A CHANNEL diagram are merely descriptive and their only
purpose is to remind you that you have set the delays for that listening point!
Fig.2
Fig.3
83 cm
127 cm
132 cm
116 cm
164 cm
78 cm
90 cm
105 cm
Fig.4
Fig.5
Fig.6
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