Filter
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If no insert points are available, then method 4 would be utilized. In this situation, be sure
that the AFS 224 input level allows the 0 and +10 dBu LEDS to light as indicated above. The
input level to the amplifiers may have to be reduced in this situation so that they are not over-
driven by the signal from the AFS 224.
B – Setup Mode
The AFS 224 setup mode is used to set the Total Number of Filters and the Number of Fixed Filters
in each channel. The number of Live filters is the difference between the Total Number of Filters
and the Number of Fixed filters (Live filters = Total Filters-Fixed filters). Note: If channels are
linked (See F-2 Linking Channels) the setup will assign the same number of filters to channel 1
and 2.
B-1 Entering Setup Mode
Press and hold the channel 1 <MODE> button until the Filter LED's light from left to right
and repeat. Release the channel 1 <MODE> button to enter the Setup Mode. This is indi-
cated by the <MODE> button lighting yellow. You are now in the Set Total Number of Filters
mode.
B-2 Selecting the Total Number of Filters
The Set Total Number of Filters mode is indicated by the channel <MODE> button lighting
yellow when in the Setup mode. The current setting for the Total Number of Filters is indi-
cated by the number of Filter LED's lit for that channel. To change the Total Number of Filters
use the channel <LIVE FILTER LIFT> button to increment and the <TYPE> button to decre-
ment the number of filters. Each press of the button will increment or decrement the Total
Number of Filters. Press and hold each button to slowly increment or decrement the num-
ber.
W
arning: Changing the Total Number of Filters may remove feedback filters already set.
B-3 Selecting the Number of Fixed Filters
Use the selected channel <MODE> button to toggle to the Set Number of Fixed Filters mode
indicated by the selected channel’s <MODE> button, which will light green. The current set-
ting for the Number of Fixed Filters is indicated by the number of Filter LED's lit for that chan-
nel. To change the number of Fixed Filters, use the selected channel’s <LIVE FILTER LIFT>
button to increment and the <TYPE> button to decrement the number of filters. Each press
of the button will increment or decrement the Total Number of Fixed Filters. Press and hold
each button to slowly increment or decrement the number. Pressing the selected channel ‘s
<MODE> button will toggle between the Set Total Number of Filters and the Set Number of
Fixed Filters mode for each channel. If the channels of the AFS 224 are linked (see F-2
Linking Channels) the above procedure will set the same number of filters for both channels.
W
arning: Changing the Number of Fixed Filters may remove feedback filters already set.
B-4 Exit Setup Mode
To exit the setup mode and return to operation mode press and hold the channel 1 <MODE>
button until the Filter LED's light from left to right and repeat (same as entering Setup mode).
C - Using Fixed mode
The AFS 224 offers two main modes of operation, Fixed and Live. Fixed mode is used to detect
and remove feedback problems in the system due to microphone placement, room modes etc.
Once set these filters are not removed until reset or cleared. Live mode detects and removes
feedback during a performance or event.
User Setup
Operation
AFS 224
AFS 224 User Manual
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