ADVANCED MANUAL / Bit One /
40
9.10
SET DISTANCE AND DELAY
This setting is based on an automatic system allowing to calculate
the time the 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) and at the 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 One automatic system will change them into time
(ms - milliseconds). It does not assign the delay (0,0 ms) to
the farthest speaker (usually the Subwoofer) while it assigns
progressively growing delays as much as the other speakers
position get closer to the listening point, in order for all the
emission points to reach the listening point at the same time.
S
ET DISTANCE
It lets you set the distance between the interested speaker and the
listening point. Choose
cm
(centimetres) or in (inches).
DELAY ms/default
It displays the time in ms (milliseconds) calculated according to the
distance.
DELAY ms/fine set
The calculation system of the Bit One time delays lets you also
perform a manual fine-adjustment.
Preliminary remarks
Fine set and Phase Delay
The delay assignment according to the distance calculation is
theoretical. That is, small variations need to be applied due to small
errors in distance measurement, due to the back-wave reflections
inside the car compartment and, mainly, due to the speaker phase
problem.
Two speakers reproducing two areas of frequency one close
to the other (ex. Woofer and Midrange), in their crossing area
will simultaneously reproduce, 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 acting on the “
fine set
” you can partly also correct problems of
Phase Delay
.
By acting on the
“fine set”
you can change the automatically set time delay.
The delay that is varied adds up to (+ x.xx) or is deducted from (- x.xx) the
value of the delay shown in the
“Delay / default”
window, that does not
change the assigned value that is the one automatically assigned.
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 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
9
Fig.1
9
