Which Digital processor/equalizer ?

Rodman99999...I guess the ECM8000 mic is not individually calibrated, and absolute SPL measurements might be off. However, the plot of frequency response (typical I suppose) is quite flat down to 50 Hz (where the plot ends) and the frequency response is quoted as 15-20KHx without a +/- dB number. Your suggestion that it falls off fast below 100 Hz does not jibe with my experience, and with results using the RS meter and Rives CD (which many people seem to believe). Where did you get this idea?

Whatever.

Fact is that I and some others find that the autoeq works fine all the way down to 20 Hz. The Behringer manual says it "may" not work well below 100. Perhaps they are worried about room resonances, where placement of the mic might yield various results. Of course each user can try it both ways, and make their own decision.

The Rives CD is excellent, BUT: How flat/accurate do you think the pick-up in a Radio Shlock SPL meter is at low frequencies(You have GOT to be kidding)? What good are response numbers without a +/- db figure(could be +/- 15 to 20db for all you know)? What do you think running a room EQ is supposed to check for? Identifying room resonances, nulls, peaks, etc. all are part of your measurement goals(why you're supposed to aim the mic at the ceiling). Where do I get my info with regards to these mics? By comparing them to actual calibrated and corrected professional mics and RTAs over the years. Whether you believe any of this or not is irrelevant, as long as you're happy with whatever you're trusting in/listening to.

BTW: If you happen to own a Behringer ECM8000 mic: Look at the frequency response curve(typical) that they have printed on the side of the box in which it came. The response actually starts to drop at 200Hz and is 2db down at 100. By 50hz, it's down 5db and rolling off even faster(they cut off the curve at that point).

Rodman99999...
Are you sure you are looking at the right box:-) And, I suppose you know that the RIVES CD has tracks which are, supposedly, compensated for the RS meter.

Since you referenced the plot printed on the ECM8000 box, something objective we can talk about, I took another close look at it. It shows a broad rise of about +1 dB peak over the range from 200 to 50 Hz. Nothing like what you describe. From 200 to something like 14 KHz it's flat +/- 1 dB. There is a rise of about 2 dB at 20 KHz, and then it rolls off. How the mic actually performs is another matter, but you are dead wrong about the plot.

Of course what's printed on the box, or posted on this website is irrelevant. I have had excellent results with the Behringer DEQ2496, and so have many others. The cost is so low that anyone who won't give it a try is foolish.

RE: The ECM8000 box's printed curve(which I'm holding in my hand). Where did you learn to read a response curve? Did you happen to notice the annotation that says, "Proximity Effect"? That means the three curves plotted(BELOW 1kHz) are at different distances from the source. Regarding these three curves: The red curve is at 2cm, and the rise is 12db above the average at 1000hz. The green curve represents 10cm(mic less than 4" from source) and has a broad 5db rise above average. At 1m(the black line)the response begins to roll off at 300Hz, and is 5db down at 70Hz, the curve's cut-off(not the 50hz as stated earier-my bad). Just continuing the same attenuation rate, the response would be -10db at 25Hz. Again- the black curve represents the response at 1m(about 3ft). I doubt anyone's listening position will be that close to their speakers, and the bass response of the mic will be much more attenuated at say 3 to 4m. The mic is flat between 200hz and 2kHz +/- 1db. Above that freq. there is a broad rise to +6 out to about 12kHz then dropping to +3db at 15kHz(where the curve ends). Of course- That's just a curve typical of these mics, and some ECM8000s will be better, some worse. The 6th octave RTA function alone makes the cost of the Behringer DEQ2496/ECM8000 a bargain, and I always try to have them on hand for my cheaper pro-sound customers. BUT- To think that one can accurately adjust one's in-room bass response, without first determining the mic's roll off at the listening position(and compensating for it in your calculations) is purely delusional. That's why the operations manual advises against even having the bands below 100Hz activated during the AEQ function. Behringer know's the combination's limitations. I'm certain many will be satisfied with the results of a DEQ2496 in their system(Look how big Stereo Review's circulation was over the years). Again- If you're happy.........