ADVANCED MANUAL / bit Ten /
35
This setting automatically calculates the time speaker sound takes to get to the
listener’s ear
(Fig. 1)
.
Preliminary Remarks
Sound moves through the air at a speed of 343 mt/sec (1.125 ft/sec) at a
temperature of 20°C (68°F). If you know the distance from the sound emission
point, you can then calculate the time sound takes to get to the listener’s ear.
If you set the distances of the different speakers in your system, the
bit Ten
will automatically change them into time (ms - milliseconds). It does not
assign a delay (0.0 ms) to the farthest speaker (usually the Subwoofer)
but progressively growing delays as much as the other speakers get closer
to the listening point, in order for all the emission points to reach the listening
point at the same time.
SET DISTANCE
Lets you set the distance between the speaker and the listening point. Choose cm (centimeters) or in (inches).
The
Set Distance
boxes can be set using the cursors or by typing the numbers on the keyboard.
DELAY ms/default
Displays the time in ms (milliseconds) calculated according to the distance.
DELAY ms/fine set
The
bit Ten
time delays also let you perform manual fine-adjustment.
Preliminary Remarks
Fine Set and Phase Delay
Delay assignment according to distance calculation is theoretical. That is, small variations need to be applied due
to small errors in distance measurement, back-wave reflections inside the car compartment and, mainly, the
speaker phase problem.
Two speakers reproducing two areas of frequency close to each other (e.g. Woofer and Midrange) will
simultaneously reproduce in their crossing area, at attenuated level, the same frequencies. Due to the different
nature of the speakers, they will show a difference in phase that, for a short frequency interval, works like a time
delay. By using
Fine Set
you can partly correct these problems of
Phase Delay
.
By using
Fine Set
you can change the automatically set time delay.
This delay adds to (+ x.xx) or is deducted from (- x.xx) the value of the delay
shown in the
Delay / Default
window, and does not change the value
automatically calculated.
Assigning a positive value (+ x.xx) with
Fine Delay
means increasing the delay
of that speaker and thereby takes it closer to the listening point.
Likewise, assigning a negative value (- x.xx) means decreasing the speaker
delay and therefore moves it further away from the listening point.
In order for you to see how much
Fine Set
has been manually changed,
both delay values are shown. To see the result applied to the output, you
have to add the values shown in the
Delay / Default
and
Delay / Fine
Set boxes. A 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 appear
(Fig. 2)
.
When using
Fine Set
, the letters
Fds
will be shown in green on the corresponding
channel of the
Channel Map
(Fig.3)
.
8.11
SET DISTANCE AND DELAY
Fig. 1
Fig. 3
Fig. 2
8
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