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56
USER’S MANUAL /
SET DISTANCE E DELAY:
This setting is based on an automatic system that allows you to
calculate the time it takes for the sound of the speaker to reach the ear.
Preliminary Remarks
sound moves through the air at a speed of 343 m/sec (1,125 ft / sec.)
at a temperature of 20 ° C (68 ° F). If you know the distance of
the sound emission point, it is therefore possible to calculate the
time it takes for the sound to reach the ear. If you set the distances
of the various speakers, the automatic system of the S8 DSP
transforms them into time (ms-milliseconds). It does not assign
the delay (0.0 ms) to the farthest speaker (usually the Subwoofer)
and assigns increasing delays as the position of the other speakers
approaches, so that all emission points can reach the listening
point at the same time.
Fine set and phase delay
The assignment of the delay based on the distance calculation is theoretical. In practice, small variations must
be made due to small distance measurement errors, due to the resonances of the listening environment, and
mainly, due to the speaker phase problem. Two loudspeakers that reproduce two zones of neighbouring frequencies
(
Eg Woofer and Midrange
), in the crossing zone will reproduce the same frequencies at the same time, at an
attenuated level. Due to the different nature of the loudspeakers, these will present a phase diversity which, for
a small frequency range, behaves like a time delay
By operating on “Fine set” it is also possible to partially correct Phase Delay problems.
By operating on the “Fine set” buttons it is possible to change the delay time set automatically. The delay that is
varied is added to (+ x.xx) or reduced from (-x.xx) the value of the delay shown in the “Delay” window, which does
not change the value shown which is the one assigned automatically. Assigning a positive value (+ x.xx) with the
“Fine set” means increasing the delay of that speaker and therefore moving it away from the listening point.
Similarly, assigning a negative value (-x.xx) means decreasing the speaker delay and therefore bringing it closer
to the listening point.
6
By operating on the “fine set” the word “fds” will light up on
the corresponding channel of the “Channel Map” (
Fig.2
).
SET DISTANCE
It allows the user to set the distance between the speaker concerned and the listening point. Choose cm (centimeters)
or in (inches). The “Set Distance” boxes can be set with the cursor using the buttons.
DELAY ms
It displays the time in ms (milliseconds) calculated based on the distance.
FINE SET ms
It displays the time in ms (milliseconds) calculated based on the distance. The S8 DSP’s time delay calculation
system also allows manual fine-tuning. The “Fine set” box can be set with the cursor using the buttons.
To allow you to evaluate how much the “fine set” has changed
manually, both values are shown. To have the resulting delay
value, physically applied to the output, it is necessary to calculate
the algebraic sum of the values shown in the “Delay“ and “Fine set”
boxes. The negative value (decreasing delay) cannot be assigned
to the farthest loudspeaker but only to the others others as they
are already all delayed with respect to it. If you try to give a negative
value to the farthest speaker, an alert message will appear (
Fig.1
).
(Fig.1)
(Fig.2)
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