Phonic i7200 XrossTech, Руководство пользователя

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PHONIC CORPORATION I7200 USER
’
S MANUAL Page 10
To activate the compressor, fi rst push the Comp Key.
Pushing this button repeatedly will allow you to alternate
between the Threshold, Ratio, Attack and Release indica-
tors, and by simply rotating the XOVER/EDIT jog wheel
you are then able to adjust the properties of these at the
rates described below.
Threshold
– the threshold is the level (selectable in dB)
at which you wish to begin compression. Any frequency
below your chosen threshold will be unaffected by the
i7200's compressor. The Threshold level is selectable
between -50 and 0 dB.
Ratio
– this allows you to select the ratio at which com-
pression will occur after the level has increased passed
the threshold. For example, if your selected ratio is 2:
1, any 2 dB increase in your audio signal will only be
increased by 1 dB. The ratio of the i7200's built-in com-
pressor is selectable between 1:1 and
∞ :1.
Attack
– this will adjust the rate of attack, which es-
sentially allows you to decide how long the compressor
will wait after an audio signal has increased beyond the
threshold until the compressor kicks into action. You are
able to select the attack rate between 1 and 200 mil-
liseconds, adjustable in 1 millisecond steps.
Release
– this will adjust the compressor's rate of re-
lease, which is basically the opposite of the attack rate.
The release rate is the amount of time the compressor will
wait after the audio signal drops below the threshold until
the compressors stops squashing your unfortunate audio
signal. You are able to select the rate of release between
10 and 500 milliseconds in 5 millisecond steps, then be-
tween 500 and 5 seconds in 20 millisecond steps.
NB. When the ratio of the Compressor is set at 1:1,the compressor is
then, effectively, disabled. If you wish to turn the Compressor off,
this ratio should be applied. Also, when selecting the Threshold,
Ratio, Attack, and Release rates, the XOVER/EDIT jog wheel must
be pushed to con
fi rm your setting.
Using the Limiter Function
A limiter is essentially a compressor with a fi xed com-
pression ratio; in the case of the i7200's limiter, the ratio
is
fi xed as ∞ :1, in essence ensuring no audio increases
past the selected threshold. Setting up of the limiter is
accomplished in the same way as the compressor, by
fi rst pushing the Limiter Key, followed by the use of the
XOVER/EDIT jog wheel to alter the threshold and release
properties.
Input Signal (dBu)
Output
Signal
(dBu)
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It may be desirable to use both the compressor and
limiter simultaneously,
fi rst activating the compressor,
to reduce the increases in the audio level, then the
limiter, actively stopping signals from increasing above
a selected level.
NB
. If you wish to turn the Limiter off, you should set the threshold at 0
dB, which will cut off all frequencies above this level. This will give
you a great dynamic range of audio.
Muting Channels
Muting can be accomplished by pushing the one of the
muting buttons on the face of the i7200. Pushing the mute
button that corresponds with the output you wish to mute
will not only halt any signal being sent to that particular
output, but will also be accompanied by an illuminated
LED. Pushing the same button will deactivate the muting
of that channel.
Selecting the Delay
Depending on the positioning of speakers in relation to
one another (among other contributing factors) it may
be necessary to activate a short delay on certain output
channels. The delay is selectable by
fi rst pressing the
Delay button on the face of the i7200. Then, by using the
XOVER/EDIT jog wheel, select the rate of delay between
0 and 20 milliseconds. This can be done separately for
each individual output channel.
NB.
When selecting the Delay, the XOVER/EDIT jog wheel must be
pushed to con fi rm your setting.