Sabine Rack Mount Single Channel Feedback Exterminator

$69.00

Model# FBX-900

Automatic Controlled Sound Equalization Feedback Annihilator with Factory Shipped Power Supply

The FBX-900 Filters out annoying feedback by dropping that offending band on its electronic internal equalizer then over time it slowly brings that dropped band back up to where it was before the feed happened. Unless it detects feedback again it stays down just below the annoying squeal. You then can see where the offending band is by the observing the red led’s across the front of the unit. If the red light is off the band has been automatically lowered. You can make real time adjustments on the monitor EQ band that matches the red light that’s off. Keep lowering the EQ band until all the red Led’s are lit to correct the trouble. It is a known fact that empty buildings and crowded buildings can change your feedback threshold and this can happen throughout the show, also rainy days and dry days can effect feedback. That’s what makes this equipment so handy, I don’t play this loud anymore so that is why it is up for sale.
This is a rare model... this unit was upgraded to the 901 model, which allowed for a finer bandwidth attack and so that the older offending frequencies could be released sooner. This was a new feature of the 901. Includes the factory power supply and the operating manual also the quick reference card.

The automatic feedback controller is a single channel digital signal processor with nine 1/10- or 1/5-octave filters (selectable). It may be used on the whole mix, on sub-groups, or on selected insert points. The unit will automatically sense feedback and determine its pitch, then assign a digital notch filter to the resonating frequency to automatically eliminate the feedback. The FBX-900 use two types of user-selectable notch filters: "fixed" or "dynamic." The fixed filters will remain set on the initial feedback frequencies, while the dynamic filters are automatically reassigned with new frequencies as feedback occurs during the program.

The feedback controller include the following:
an active/bypass button and LED indicator, which allow the user to set the unit to control feedback (active mode) or take the unit out of the signal path so it has no effect on the program (bypass mode) a clip level adjust, which controls system gain. Clip LEDs, which indicate clip level and also indicate threshold level when enabling the selectable noise gate. Reset switch so all filters may be re-configured, "lock fixed" button and LED indicator which allows the user to lock fixed filters created during system set-up and to limit the total number of active filters. Row of filter stage activity LEDs to indicate active filters and a two-position rocker-type power switch, also provided is a jumper on the engine board for selecting 1/5- or 1/10-octave filters.

The unit is provided with 1/4" TRS and XLR balanced and unbalanced input and output. The following performance criteria is met: Nine independent digital notch filters controlled automatically from 51Hz to 17,000Hz. Filter width: 1/10 or 1/5 octave (selectable), constant Q. Filter depth: DSP controlled, variable to -50dB. Resolution: 1/20 octave or better. Time required to find and eliminate feedback: 0.4 seconds, typical @ 1KHz. Total number of combined filters active: user selectable, from 1 to 9. Number of dynamic vs. fixed filters: user selectable. Last configuration stored in memory.

Specifications:
Input impedance: unbalanced 10KΩ; balanced > 10KΩ, PIN 2 high.
Output impedance: balanced or unbalanced 10Ω nominal, PIN 2 high; maximum load 600Ω
Input/output maximum signal levels: balanced +24dBV peak; unbalanced +18dBV peak.
Headroom: balanced +20dB @ +4dBV nominal input; unbalanced +14dB @ +4dBV nominal input.
I/O connectors: XLR-3 and 1/4" TRS.
Bypass: Switched, balanced to balanced; unbalanced to unbalanced.
Input/output transformer option.
Frequency response: < +/- 0.5dB, 20Hz to 17,000Hz. Signal to noise ratio: > 86dB typical (bal) @ +22dBV in.
Total harmonic distortion: < 0.015% @ 1 KHz @ +22dBV. Dynamic range: > 92dB.
Input to output gain variation: +/- 1dB.
Selectable noise gate.
Power supply: +13.5 -13.5VAC @ 750 mA.
Memory backup battery life: 10 years.
Dimensions: 1-U rack mount; 19 x 1.75 x 5.5 in. nominal; 483 x 45 x 139 mm
Weight: 2.7kg (6.0 lb)
Used – Very Good