2
1. SETUP
Press and hold this button to begin the FBX setup mode. Filter
LEDs (light emitting diodes) will ash 5 times and the SETUP
LED will begin to ash. You are now ready to set FBX lters.
2. READY
The READY LED lights when the automatic FBX setup process
has completed, or the READY button has been pressed. This
indicates your unit is ready for operation. The total number of
lters available for feedback ltering is 12; in the factory default
setting, your unit will automatically enter READY mode when
the tenth lter is set. Alternatively, you may enter READY status
with fewer Fixed FBX lters in place, simply by pressing the
READY button at any time. Press READY again to lock the
Fixed lters.
3. BYPASS
Bypass mode takes the unit out of the signal path so that it will
have no effect on the program. In active mode, the unit controls
feedback automatically. The red BYPASS LED lights when the
unit is in bypass mode.
4. SIGNAL LEVEL
The LED ladder indicates the signal strength relative to the
FBX's input clip level.
SECTION ONE — FRONT & BACK PANELS
1.1. FBX2420 Front Panel Controls & LED Indicators
9. A/C Power Input
The FBX1220 & FBX2420 Series is factory congured to
operate at 230 VAC. Using the wrong input voltage may cause
permanent damage to the unit and will void the warranty.
10. Fuse
This equipment is tted with an IEC power inlet incorporating a
built-in fuse holder. To change the fuses in this socket:
1. Disconnect the power cord from the unit.
2. Pull out the fuse holder and remove the old fuse.
3. Install a new fuse into the holder. Replace only with one
of the following fuses:
• 230 VAC: 0.1 A, 10 W, 0.160 A SB fuse
4. Ret the fuse cover.
11. Power Switch
Previous settings retained during power-off.
12. Quarter-inch Output
TRS balanced or TS Unbalanced output .
13. Input/Output Level Switches
Set to match your desired Input/Output level congurations.
For unity gain set both switches to the same postion.
14. XLR Output
XLR balanced output.
15. Quarter-inch Input
TRS balanced or TS unbalanced input.
16. XLR Input
XLR balanced input.
1.2. FBX2420 Back Panel Controls & Connections
5. RESET DYNAMICS & DYNAMIC FILTER TIMER
Press and hold this button until the Dynamic lter ash and
LEDs go off to reset all Dynamic lters. See Section 5.2.4. for
enabling and setting the Dynamic Filter Timer.
6. NUMBER FIXED
Set the number of available xed lters by pressing the NUM-
BER FIXED button (6) until the LEDs stop ashing, then release
it. The LEDs (8) will begin to light in sequence. When the LED
corresponding to the desired number of xed lters lights, press
the Number Fixed button to register your selection.
7. FIFTH OCTAVE
Press the button at any time to select wider lters for any new
lters to be set. It is possible to have both 1/5 and 1/10 octave
constant "Q" lters active in one channel simultaneously.
8. FILTER STAGE ACTIVITY
When one of the unit’s lters is activated, the corresponding
LED lights. A blinking LED
indicates the lter that was
most recently activated.
842
1 3 5 7
6
12 14 12 14
13 13
151615 1610119
13 13
Note: FBX1220 front and back panels
use the same controls and
input/output conguration
(4 pages)
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