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(More customer reviews)I bought this to use as a parametric EQ, not for feedback elimination. Although I did attempt to use it for feedback just to see what it did, I'm only rating it as an EQ. For feedback I didn't have a lot of luck with it's auto setup in my quick experimentation.
As an EQ it seems to work well. Although I prefer lots of knobs over lots of buttons and one knob, once you get used to it you can cruise through setting and tweak filters pretty easily. My main goal was to eliminate some low frequency boom and room resonances on some live sound monitor speakers. I also tried (successfully) using it with the free REW (room eq wizard) software. Very slick. Run a frequency sweep, look at a graphic of the room response, have the software generate filters to improve system response, have the predicted corrections shown graphically ...then have the PC download the filter settings over MIDI to the EQ automatically ...then re-sweep the room and see the improvements. Nifty.
My one complaint is that when the unit was shipped to me, there appeared to be bogus frequency settings in the unit. When I first tried to update one of the parametric filters, I lost the output from the unit. Cycling power did not help. I got sound in bypass mode, but not when the filter chain was active. I found that if I went to a filter and adjusted the gain before adjusting the frequency the unit would cut out. If I adjusted the frequency, then gain, all was well. The only way to get output after it was lost was to either disable the offending filter (gain=0) or adjust the frequency of that filter (and cycle power). What I determined was that the initial frequency values stored in the unit were crashing the DSP when the gain was adjusted and no update had been made to the default frequency. Although the display showed a valid frequency (trying to remember, 29.5Hz maybe?) as soon as you adjust the frequency knob in either direction, it jumps to 20kHz. I think basically the EPROM that stores the filter settings is pre-programmed in a way that presents invalid data to the DSP and causes it to crash. A guess here, I'd love confirmation from Behringer. Are you reading?
Okay, one other little issue. The frequency adjustment is not wrap-around. It starts you at 20kHz ...and most of the time I want to be in Hz ...so it takes forever to scroll down to where I want to be.
Overall happy once I determined why the output kept shutting off. Hopefully this helps someone else out if they run into the same problem!
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