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Product 189009

Sabine FBX2400 2-Channel Feedback Exterminator   

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The performance-saving power of the Sabine FBX2400 with SMARTFilters lies in it's ability to control feedback during the program, not just at setup t...Click To Read More About This Product

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Fast, transparent, and reliable feedback control.

The performance-saving power of the Sabine FBX2400 with SMARTFilters lies in it's ability to control feedback during the program, not just at setup time. If feedback occurs during that crucial moment of the show, in the middle of the big solo, or just when the worship leader begins the sermon, the FBX Feedback Exterminator places a filter that only kills the feedback, not the sound and power you work so hard to achieve. Think of the Sabine FBX as a very advanced set of automatic parametric filters. If you had the time, the filters, and the test equipment, you could find the feedback frequencies, dial in the precise filter location, and make a very narrow filter, just deep enough to remove the offending tone. The FBX2400 does it all for you automatically, and it does it faster than any other method.

How does the Feedback Exterminator do it? First let's consider just how a superior feedback control filter should behave. Filters can be described by their Speed, Accuracy, Resolution, and Sonic Integrity.

Speed: The industry's best digital signal processors that run the SMARTFilter algorithm give the FBX2400 a distinct speed advantage over all other automatic feedback controllers. And in Setup Mode the speed is increased, so you can complete your entire setup of the FBX in less than 30 seconds. During the show the 24-bit FBX is constantly on the watch for feedback, never allowing it to ruin your show. Filters are placed almost immediately (in 0.4 seconds at 1 KHz).

Accuracy: Is it music or is it feedback? This is the most difficult question your feedback controller must answer. A wrong decision means you waste filters (less gain for you) and punch unnecessary holes in your sound. The FBX has always excelled in it's ability to make the right decision, and the new SMARTFilter technology makes it even better. Less sophisticated feedback controllers place filters on any loud tone, even if it is music, but the FBX2400 uses a patented analysis of the harmonic content of your program material. Because feedback is low in harmonics, and music and speech are rich in harmonics, the FBX Feedback Exterminator is able to make the correct and accurate answer to the music or feedback question.

Resolution: This is a big one. Now that we know feedback is happening, we need to target it precisely. Many feedback controllers place their filters in the general vicinity of the feedback and then widen the filters until the feedback goes away. The FBX uses a more sophisticated solution. It centers the filter exactly on the frequency that is feeding back. This unique one-Hertz resolution enables the FBX2400 to control feedback with transparent filters that are ten times narrower than graphic equalizer filters, which can only muster 31 spots to place their very wide filters. Feedback frequencies are single tones, and that means there can be almost 20,000 places for them to occur in the audio spectrum. You can see that using a feedback control device with less resolution is like shooting a fly with a shotgun. You may eventually get that fly, but it will take a lot of shooting and cause a lot of damage!

In contrast, the FBX2400 Feedback Exterminator places these accurately chosen filters with one Hz resolution. This means a direct hit on a single feedback tone ” every time.

Sonic integrity: Sabine's innovative approach to digital filtering is unique in the industry. Our filters just sound better, with far less phase distortion and a smoother response. Sabine filters maintain their integrity at all depths, providing true Constant Q performance.

Some feedback suppressors tout the benefits of more filters, but why add more filters than you need? The FBX processor could easily produce 50 filters, but they would only degrade your sound. Sabine's thirteen years of experience as pioneers and inventors of automatic feedback control have discovered that no more than twelve filters are most effective.

Total Control: The 2-channel FBX2400 is for controlling feedback for the whole mix in both mains and monitors, and is patched between mixer and power amps.

  • SMARTFilter Technology
  • Super-fast Automatic Feedback Control
  • Quick and Quiet Setup
  • Accurately distinguishes music from feedback
  • Places filters with 1 Hz resolution
  • Transparent ” leaves your sound clear and untouched
  • Provides more gain before feedback (6 to 9dB typical)
  • 24-bit Digital Resolution
  • Three-color LED filter display
  • 12 Filters per channel
  • Flexible Filter Controls
  • Timed or Manual Dynamic Filter Reset
  • XLR & 1/4"TRS inputs/outputs

FBX2400 2-Channel Feedback Exterminator

    12 independent digital notch filters per channel, controlled automatically from
    40 Hz to 20 KHz.
    Filter width: user-controllable ” either 1/10 or 1/5 octave*, constant "Q"
    Resolution: 1 Hz
    Time required to find and eliminate feedback: 0.4 seconds, typical @ 1 KHz
    Number of Dynamic vs. Fixed filters per channel: user selectable. Last
    configuration stored in memory.
    Dynamic Filter Timer: Resets dynamic filters in 1, 5, 30, or 60 minutes

    Input/Output Maximum Signal Levels: Balanced +27dBV peak, unbalanced
    +21 dBV peak
    Output Drive: Unit will perform as specified driving a load >600 Ohms
    Input Impedance: Balanced or unbalanced >40K Ohms, PIN 2 high
    Output Impedance: Balanced or unbalanced 150 Ohms nominal, PIN 2 high
    Bypass: True power off bypass
    Headroom: +23 dB peak @ 4 dBV nominal input, balanced
    I/O Connectors: XLR-3 and 1/4" TRS

    Frequency response: 20 Hz - 20 KHz +/- 0.3 dB
    Gain matching: +/- 0.2 dB
    Spectral Variation: + .25 dB, 20 Hz to 20 KHz
    SNR - Dynamic Range: >100 dB
    THD: .005% at 1 KHz
    < 0.01% 20 Hz - 10 KHz
    < 0.025% 10 KHz - 20 KHz
    Dynamic Range: >105 dB

    115 VAC: 100 - 130 VAC 50/60 Hz
    230 VAC: 200 - 240 VAC 50/60 Hz

    115 VAC, 0.1 A, 10 W, 0.160 A SB fuse
    230 VAC, 0.06A, 10 W, 0.160 A SB fuse

    1-U rack mount; 19 x 1.75 x 6.25 in. nominal (rack mountable);
    48.3 x 4.5 x 15.9 cm nominal
    8.0 lbs. (3.6 kg) nominal

    Safe operating temperature: -15 to +50 degrees centigrade ambient
    temperature (5 to 122F)
    *Below approximately 200 Hz the feedback filters become slightly wider to
    increase the feedback and rumble capture speed at these low frequencies.


Review Snapshot

by PowerReviews

(based on 3 reviews)

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Reviewed by 3 customers

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(1 of 1 customers found this review helpful)


Best in this range

By Anonymous

from Undisclosed

The main FEATURE that makes it rate a 5: It's EASY.You can train a bass player ( like me ) to use it in 30 seconds.Quality: VERY LOW NOISE. > -106dB104dB dynamic range. If you don't know what those numbers mean, then this is the unit for you, because it does everything automatically without any manual or math. It sounds great without distortion or coloration.Unlike low-priced competitors, this is American made and designed. So unless you want to give some of your money to underpaid Chinese laborers and mostly to a Exploitative German Globalist, buy this one. It only costs 25% more, but it will keep working and can be repaired without hassle. Try doing that with Behringer! Value: If you need a feedback eliminator because you have a good PA and want maximum performance, AND you want to protect vulnerable tweeters, THIS IS what you want. It is an insurance policy against Karaoke amateurs, and excitable rock-stars who are ignorant of mic-technique. If you have a crappy PA, this won't fix it, but it will prevent the feedback that crummy speakers are so prone to. And if you run Karaoke, (you soul-killing slime) you definitely need this. And if you run Karaoke, please at least learn how to pronounce Kar-uh-oh-kee; (not car-oh-kee!)


Used right, it works awesome.

By Anonymous

from Undisclosed

I use 3 channels of this on monitors for a 3 guitar rock band. I've had real success with this unit without killing the sound. I really need a fourth channel for the last monitor channel. Its the one squealing now. If you can, use the setup mode before the crowd gets there. Then lock the fixed filters. Huge boost in gain. The auto filters take care of the rest. With all feedback destroyers, you must lock your filters after they are first set or they will go deeper and wider.


tone freak

By Anonymous

from Undisclosed

I can't believe there is not a review already written about this simple to use, well built, American made and most important; effective product. It is not a cure-all, but man, what a help for mimimizing feedback. simply plug it in and out of your signal chain(the manual says at the end but a sabine tech sugested at the begining of the chain). I've not experimented enough to for sure wich is best, but I do know it works great. Another trick I learned was not to try locking the filters by raising the volume. the manual sugests the 2nd method wich I think works as good. simply push the "ready" buttons on both chanels and start playing. The filters will start to lock as needed- refer to the opertion manual. This technique works great and this tool is a must for any live performance. One of my favorite devices in my rack!

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