I've got a bit of experience with Behringer. It can be a roll of the dice whether the thing you buy from them will=20 last or die. The reviews on this thing at Musicians Friend are typical for a=20 Behringer product; some really good, some not so much. Heat problems and warped relay cases are mentioned. But it sure appears to be packed with capability. I wonder how it would=20 work processing monitor feeds to get more gain before feedback. I could think of other uses for it. As much as I distrust Behringer, I have ended up with several pieces of=20 their equipment and I'm pretty happy with it, given the cost and features. I have one of the older feedback destroyers. I couldn't get it to do=20 anything useful that still sounded good. Mark Skeels Engineer Competition Electronics, Inc. TEL: 815-874-8001 FAX: 815-874-8181 www.competitionelectronics.com On 5/18/2011 5:46 PM, Jonathan Hallameyer wrote: > On Tue, May 17, 2011 at 12:09 PM, Mark E. Skeels > wrote: >>> Have a look at a couple of recent issues of Circuit Cellar. There are >>> two projects this year where a dsPic has been used to make an audio >>> frequency analyser, displaying on a LED bargraph. The most recent one >>> is a stereo one. These should give you a feel for doing DSP on audio. >>> I had assistance from a guy to set up a sound system in a church which >>> was almost a pentagon shape on the ground plan (the sides were not all >>> equal length) and this created all sorts of echo problems. He used a >>> similar analyser made out of a number of analogue filters, with about >>> 5 or 6 channels. We fed a white noise source into the speaker system, >>> and used a microphone at the normal speaking position fed into the >>> analyser. The frequency response was then adjusted using the equaliser >>> on the speaker system so that the displayed frequency response was >>> flat. It made a big difference to how much level you could before >>> feedback, as it meant there wasn't a frequency with a highish Q 'hump' >>> in the response. >> Cool! I will definitely check that out. >> >> Mark >> -- >> http://www.piclist.com PIC/SX FAQ& list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > Ive used a similar device, pretty sure it was behringer as the > styling of the front panel was the same, but may not be the same > device as this > http://www.behringer.com/EN/Products/DEQ2496.aspx > > You buy a "reference" omnidirectional mic, hook it up the the mic > input, and it plays pink/white noise (as desired) over the speakers, > and it can either auto-level the response of the whole system, or just > show the results on the real time analyzer for you to tweak as needed. > Feedback destroyer was nice, though violins tended to irritate it, > so I mainly left it on manual, with high Q (10-30+iirc) band-stop > filters on problem frequencies, leaving the parametric and graphic EQs > free for other stuff. For your situation, I'd expect a the reference > mic mounted where you want your mic to go, and a speaker where the > usual sound emitter would go. An EQ can knock down peaky frequencies > and bring up low ones, but it cant fix cancellation due to reverb, and > reverb in general making the sound quality poor. Damping if possible > would definitely be the most effective place to start imo. As others > said, if you can get fabric drapes etc up that helps, but also the > drapes can conceal ugly stuff such as more effective sound absorbing > matl etc... > > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .