Applications Guide
®

386 User Manual

9
Operation AFS 224

Application 3 - Insert on the Subgroups of a Mixer

This setup is ideal for applications that require feedback suppression on certain instruments

such as microphones, while keeping instrument that desire feedback (such as guitars) separat-

ed. This application provides the user with dual channels of 24 filter suppression per stereo

channel of the mixing console subgroup.

1. Connect the stereo output inserts of the mixer to the inputs of the AFS 224.

2. Connect the outputs of the AFS 224 to the insert returns of the console.

3. Making sure that all outputs are muted, apply power to the mixer and amplifiers.

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 for 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 Subgroup Input

Channel 2

AFS 224

Subgroup Input

Channel 1

AFS 224

Insert

Returns

Microphone In

AFS 224 User Manual