Ringing Out The Sound System; Using The Wizard; Manual Method - dbx AFS2 Owner's Manual

Ringing Out The Sound System

Fixed filters are set before a performance in a process called 'ringing out a system' . This is done after all other system EQ has
been performed. Ringing out the sound system for feedback before use allows you to squeeze more gain out of the system
before the onset of feedback and can help ensure you're not right at the edge of feedback during system use.
The AFS2's Wizard does a great job of taking the guesswork out of ringing out the sound system. However, you can also ring
out the system manually. This allows you to select different filter width settings for the Fixed verses Live filters and precisely
determine how many Fixed filters will be used to maximize the system's gain before feedback, freeing up all remaining filters
for Live Mode use.
NOTE:
AFS works best when the signal coming into the AFS2 is sufficiently optimized. See 'Gain Structure' on
page 6 for further information on optimizing the gain structure between your mixer and the AFS2.

Using The Wizard

To use the Wizard, just press the big, red Wizard button and follow the on-screen instructions. It's as simple as that! Note that
pressing and holding the
MENU/BACK
menu.

Manual Method

To manually ring out the sound system:
Set both channels to bypass using the
1�
Make sure all filters are cleared before beginning, see 'Clearing Filters' on page 17 for further information.
2�
Perform a sound check and set up a rough mix for all microphones which will be active during the performance. When
3�
done, take note of the mixer's main output fader position (mixer master sends if ringing out stage monitors or subgroup
faders if ringing out subgroups) – your target gain when ringing out the system will be around 5 dB above this setting.
If noise gates are being used on any of the active mics – including vocal effect processors with built-in noise gates –
4�
bypass them before ringing out the system. You can re-enable them once the ring-out procedure is complete.
Have the musicians stop playing and fully lower the main mixer faders (mixer master sends if ringing out stage monitors
5�
or subgroup faders if ringing out subgroups).
Turn STEREO LINKED on or off depending upon desired operation (see previous page).
6�
Set the FILTER MODE parameter to FIXED. This parameter can be found by pressing the
7�
Home Screen then selecting AFS OPTIONS from the menu.
Set the FIXED FILTER parameter in the AFS OPTIONS menu to 12.
8�
Set the CONTENT MODE parameter to select the desired width for the Fixed filters – select the MUSIC option for the
9�
most precise and inaudible feedback suppression.
Adjust the VIRTUAL HIGH PASS parameter if you do not want to allow AFS to notch out lower frequencies.
10�
Ensure the musicians are not playing then unbypass the channels you wish to ring out using the
11�
buttons.
NOTE:
When ringing out the system in Fixed Mode, any sustained sound detected by AFS will trigger Fixed filters
to be set. Therefore, make sure the microphones are active, but there is no appreciable signal present at the mics.
button during the Wizard process will abort the procedure and return to the AFS main
buttons.
CH 1/CH 2 BYPASS
button from the
BACK/MENU
CH 1/CH 2 BYPASS
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