2
1. SETUP
Press and hold this button to begin the FBX setup mode. Filter
LEDs (light emitting diodes) will flash 5 times and the SETUP
LED will begin to flash. You are now ready to set FBX filters.
2. READY
The READY LED lights when the automatic FBX setup pro-
cess has completed, or the READY button has been pressed.
This indicates your unit is ready for operation. The total num-
ber of filters available for feedback filtering is 12; in the factory
default setting, your unit will automatically enter READY mode
when the tenth filter is set. Alternatively, you may enter READY
status with fewer Fixed FBX filters in place, simply by pressing
the READY button at any time. Press READY again to lock the
Fixed filters.
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 con-
trols 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. FBX2400 Front Panel Controls & LED Indicators
9. A/C Power Input
The FBX1200 & FBX2400 Series is factory configured to oper-
ate at either 115 VAC or 230 VAC. Using the wrong input volt-
age may cause permanent damage to the unit and will void the
warranty.
10. Fuse
This equipment is fitted 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:
• 115 VAC: 0.1 A, 10 W, 0.160 A SB fuse
• 230 VAC: 0.06A, 10 W, 0.080 A T fuse
4. Refit the fuse cover.
11. Power Switch
Previous settings retained during power-off.
12. Quarter-inch Output
TRS balanced or TS Unbalanced output (using a TS unbal-
anced connector will result in loss of 6 dB gain).
Important: Refer to section 5.2.
13. Input/Output Level Switches
Set to match your desired Input/Output level configurations.
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 (mixing balanced and
unbalanced connections may result in a 6 dB loss of gain).
Important: Refer to section 5.2.
16. XLR Input
XLR balanced input.
1.2. FBX2400 Back Panel Controls & Connections
5. RESET DYNAMICS & DYNAMIC FILTER TIMER
Press and hold this button until the Dynamic filter flash and
LEDs go off to reset all Dynamic filters. See
Section 5.2.4.
for
enabling and setting the Dynamic Filter Timer.
6. NUMBER FIXED
Set the number of available fixed filters by pressing the NUM-
BER FIXED button (
6
) until the LEDs stop flashing, then re-
lease it. The LEDs (
8
) will begin to light in sequence. When
the LED corresponding to the desired number of fixed filters
lights, press the Number Fixed button to register your selec-
tion.
7. FIFTH OCTAVE
Press the button at any time to select wider filters for any new
filters to be set. It is possible to have both 1/5 and 1/10 octave
constant "Q" filters active in one channel simultaneously.
8. FILTER STAGE ACTIVITY
When one of the unit’s filters
is activated, the correspond-
ing LED lights. A blinking
LED indicates the filter that
was most recently activated.
FILTER COLOR KEY
RED
= FBX Fixed, Locked
AMBER = FBX Fixed, Unlocked
GREEN = FBX Dynamic
8
4
2
1
3
5
7
6
12
14
12
14
13
13
15
16
15
16
10
11
9
13
13
Note: FBX1200 front and back panels
use the same controls and
input/output configuration