Application Guide
Application 1 - Insert On the Microphone Channel
This application is ideal for dedicated feedback suppression on microphone channels of a mix-
ing console. This application provides the user with individual channels of 24 filter of feed-
back suppression per microphone.
1. Connect the channel insert output from the mixer to the input of the AFS 224.
2. Connect the output of the AFS 224 to the insert return of the mixer.
For maximum performance and proper operation, the input signal to the dbx 224 must cause
the “0” dBu LED to light fairly consistently and the “+10” dBu LED to light occasionally. Be
sure to check the mixer’s manual of the nominal operating point for the insert jacks, and then
select the +4dBu or -10dBV switch on the back of the 224 accordingly.
Pan
Mute
-10
0
+5
+10
-20
-30
-∞
-5
L / R
Mute
L / R
Mute
L / R
Mute
L / R
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5
1234
-10
0
+5
+10
-20
-30
-∞
-5
-10
0
+5
+10
-20
-30
-∞
-5
-10
0
+5
+10
-20
-30
-∞
-5
Mute
L / R
5
-10
0
+5
+10
-20
-30
-∞
-5
Mute
L / R
6
-10
0
+5
+10
-20
-30
-∞
-5
Mute
L / R
7
-10
0
+5
+10
-20
-30
-∞
-5
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Mute
L / R
8
-10
0
+5
+10
-20
-30
-∞
-5
Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5 Pan
-5
-4
-3
-2
-10+1
+2
+3
+4
+5
Mute
L / R
-10
0
+5
+10
-20
-30
-∞
-5
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Aux 1
0
2
46
8
10
Aux 2
0
2
46
8
10
Mute
L / R
-10
0
+5
+10
-20
-30
-∞
-5
Output A Output B
Microphone In Input
Channel 1
AFS 224
Input
Channel 2
AFS 224
Microphone In
Applications
®
7
Operation AFS 224
AFS 224 User Manual