Audison bit Ten D User Manual

ADVANCED MANUAL / bit Ten D /
36
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 D
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 D 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.
If you assign a positive value (+ x.xx) with the “fine delay” it means to increase
the delay of that speaker and so to take it at a further distance from the listening
point. Likewise, assigning a negative value (- x.xx) means to decrease
the speaker’s delay and therefore to move it closer to 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
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Audison bit Ten D Specifications

General

Brand	Audison
Model	bit Ten D
Category	Computer Hardware
Language	English