FBX2020P-OpGuide-031104.pmd - hto
9
FILTERS
12 independent digital notch filters per channel, controlled auto-
matically from 40 Hz to 20 KHz.
Filter width: user-controllable - either 1/10 or 1/5 octave, constant "Q"
Resolution: 1/50 octave from 100 Hz to 20 KHz
Time required to find and eliminate feedback: 0.4 seconds, typical
@ 1KHz
Total number of combined filters active per channel: user select-
able, from 1 to 12
Number of dynamic vs. fixed filters per channel: user selectable
LAST CONFIGURATION STORED IN MEMORY
INPUT/OUTPUT**
Input/Output Maximum Signal Levels: Ba27dBV peak,
unba21 dBV peak
Output Drive: Unit will perform as specified driving a load >600 Ohms
Input Impedance: Balanced or unbalanced >10K Ohms, PIN 2 high
Output Impedance: Balanced or unbalanced 10 Ohms nominal, PIN
2 high
Bypass: True power off bypass
Headroom: +23dB peak @ 4dBV nominal input, balanced
I/O Connectors: XLR-3 and 1/4" TRS
FBX2020-Plus ENGINEERING SPECIFICATIONS
Filter 1
Filter 12
Filter 11
Filter 2
ADC
DAC
DSP
Feedback Detection
Center Frequency - Depth Control
Bypass Switch
1/5 or 1/10 Octave Filters
Automatic
Clip Level
Adjustment
Automatic
Clip Level
Adjustment
TRS
TRS
INPUT
OUTPUT
FBX-2020Plus SIMPLIFIED INTERNAL BLOCK DIAGRAM
Analog/Digital
Converter
Digital/Analog
Converter
XLR
1
3
2
XLR
1
3
2
PERFORMANCE***
Spectral Variation: + .25 dB, 20Hz to 20 KHz
SNR: >100 dB, typical, "A" weighted
THD: <0.02% @ 22 dBV sine wave at 1 KHz
Dynamic Range: >105 dB with ClipGuard™ automatic clip level
control active
POWER INPUT
Factory configured to either 115 VAC or 230 VAC. 50/60 Hz, 12 Watt
input.
FUSE REPLACEMENT
To reduce the risk of fire, replace only with 5x20 mm, .315 A, 250 V,
fast-acting fuse.
MEMORY BATTERY LIFE
7 years, typical
DIMENSIONS
1-U rack mount; 19 x 1.75 x 8.0 ins. nominal (rack mountable); 48.3 x
4.5 x 20.3 cm nominal (rack mountable)
WEIGHT
8.0 lbs. (3.6 kg) nominal
OPERATING TEMPERATURE
Safe operating temperature: 0 - 50 degrees centigrade ambient
temperature (32 - 120F)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
*Below approximately 200 Hz the feedback filters become slightly wider to increase the feedback and rumble capture speed at these low frequencies.
**(Note: Inputs may be balanced or unbalanced. For maximum output capability, outputs must be balanced (XLR or TRS). If either side of an output is grounded, the peak output and dynamic
range will be reduced by 6 dB.
*** Tests performed using an Audio Precision System One model 322 or equal.
*
