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Summary of Contents for dbx Advanced Feedback Suppression AFS224
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Page 1: Quick Start Guide
AFS224 Quick Start Guide This step by step tutorial is based on a basic configuration (AFS224 in line between mixer and amplifier) as shown below. - Page 2 Go into the Setup mode by pressing and holding the channel 1 MODE button. Hold this MODE button until the filter LEDs flash all the way across. The Mode buttons should be lit a yellow or amber color. If they are not press each MODE button until they are both yellow.
- Page 3 Select how many total filters that you want active. The default of 24 is a good place to start. However, if you want to change the total # of filters, press the LIVE FILTER LIFT button to increase the # of total filters for each channel or the TYPE button to decrease the total # of filters for each channel.
- Page 4 To exit the setup mode, press and hold the channel 1 MODE button. Hold this button until the filter LEDs flash all the way across. Press the BYPASS buttons so that they are both lit red (bypassed). Press and hold the channel 1 TYPE button to select between dual mono or stereo mode.
- Page 5 Set the “Live Filter Lift” to 10 minutes (yellow). Set the “Type” to Music Medium (yellow).
- Page 6 Perform a sound check on all of the microphones that will be active. Get them as close to the performance level as possible without feedback. You should get a reading that is close to “0” dBu on the input meters of the AFS224 when performing this sound check.
- Page 7 Pull the master faders on the mixer all the way down (no signal). Check the Mode buttons. If they are not lit green, press the buttons until they are lit green. None of the filter LEDs should be lit at this point. If they are, press and hold the BYPASS buttons until the filter LEDs flash, then release.
- Page 8 Disengage the Bypass buttons (LEDs off). Slowly raise the master faders on the mixer. As feedback occurs, Fixed filters will be set. You may want to push the faders a little past the unity gain point (or performance level). This way the system will not be right on the verge of feedback when set to performance level.
- Page 9 When you have reached the desired performance level, press the MODE buttons until they are both lit red. You are now in “Live” mode. For a faster reaction time with the Live filters, try setting the filter TYPE to “Music Low” (green) or “Speech” (off). Note: A wider notch filter (such as “Speech”) will catch the feedback faster, but may be more audible.
- Page 10 If you find that the feedback reoccurs when the Live filters are lifted, try setting a longer Live Filter Lift time or try setting it to “None” (LED off). he AFS process is now complete. If, for whatever reason, you would like to restart the process, you can do so by clearing the filters and restarting with step 1.
- Page 11 If you would like to lock the front panel (to prevent tampering), press and hold the channel 1 LIVE FILTER LIFT button. Hold this button until the filter LEDs flash all the way across (from the outside inward). To unlock the front panel press and hold the channel 1 LIVE FILTER LIFT button until the filter LEDs flash all the way across (from the inside outwards).
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