dbx AFS224 Manual - Manual (Page 8)

4 AFS™ 224 User Manual
AFS
™
224
Front Panel
Input Level Bar Graph
These four LEDs indicate the input signal level of the AFS 224. Input level LEDs range from -10dBu to
+18dBu.
NOTE: For maximum performance and proper operation, the average input signal level should
consistently light the 0dBu LED, with the +10dBu LED lighting occasionally.
Clip LED
This LED indicates that there is signal clipping at the input.
Bypass Button
Pressing and releasing this button will bypass the processing in the AFS 224 (LED on) and engage the AFS
processing (LED off). Pressing and holding the Bypass button will clear the filters on that channel. For
more information regarding clearing filters, see the “Clearing Filters” section of this manual.
Type Button
Pressing and holding this button allows you to link and unlink channels (see “Linking Channels”).
Pressing and releasing this button allows you to select the AFS Type. The AFS 224 offers several feedback
suppression types, which are: SPEECH, MUSIC LOW, MUSIC MED, and MUSIC HIGH. Each selected
type controls the width of the notch filter used to remove the feedback. MUSIC HIGH uses very narrow
notch filters, minimizing audible artifacts within the music. The SPEECH type uses much wider notch
filters, allowing the AFS 224 to work faster. The below table and graph further demonstrate the differences
between these filter types.
Description of AFS Types
Type Description LED Q
SPEECH Optimized for systems reproducing only speech. Not Lit 1/5th Octave
MUSIC LOW Faster response time, lower fidelity. Green 1/10th Octave
MUSIC MED Good combination of response time and fidelity. Yellow 1/20th Octave
MUSIC HIGH Slightly slower response time, high fidelity. Red 1/80th Octave
AFS 224 Filter Q's
Anlg Freq Response.at2
Speech - 1/5th Octave
Music Low - 1/10th Octave
Music Med - 1/20th Octave
Music High - 1/80th Octave
-9
+3
-8
-7
-6
-5
-4
-3
-2
-1
-0
+1
+2
d
B
u
-9
+3
-8
-7
-6
-5
-4
-3
-2
-1
-0
+1
+2
d
B
u
700 1.2k 750 820 850 900 .95k 1k
Hz
Front & Rear Panels