Behringer MX882 measurements and results

first graphs is loop without mx882. Second is mx882 added to the loop. Next are the mdats first without mx882 and second mx882 in the loop. I had to zip them.

I measured the soundblaster live external usb with a loop back and saved the soundblaster jpg of the graph. then I inserted the mx882 into the loop and measured the calibration and saved the graph.

Click to expand...

I'm not sure of your technique here.

Generally, when we want the response of a device. we first do a soundcard calibration and save the file so REW is pointing at it. Then as a check to see if the file is valid, we take a normal response measurement of the loopback cable to ensure that it returns a flat response. If so, we know the test equipment won't influence the measurement of the device.

Then we remove the loopback and do a normal response measurement of the device. That way we're looking at the devices response only (and not the device plus the soundcard).

Is this what you did? If so, great......

brucek

the first is a measurement of the soundcard and the second is a measurement of the mx882. They look identical to me.

I calibrated the soundcard then I reopened rew and measured the soundcard then I saved the graph then I used the mx882 and remeasured. I had to adjust the level before I could get it to work as it was clipping it said. I done this by adjusting the wav slider in windows till rew said level was okay. I did this for the soundcard only as rew said the level was okay for the mx882

You have a meter or mic calibration file loaded. It must be removed - there is no meter.....

Then redo the device measurement. We don't need to see the soundcard. We'll assume it's correct.

Yeah, that's good, but if you want to show a response of the device, you can't use the standard vertical scale of 45dB-105dB or the horizontal scale of 15Hz-200Hz.

You need to expand the vertical scale until we see get an idea of the response, and you need to offer the horizontal axis down to at least 5Hz and up to 20KHz.

Use something like a vertical axis of 70dB-80dB and a horizontal of 2Hz-20000Hz.

You do need to run the Calibrate routine after the Check Levels routine and set the Calibrate level to 75dB. That way you graphs will come out at 75dB...

brucek

i also have a mx 882, i was told that this would solve the level matching from unbalanced to balanced, this is how i have it hooked up:

all pre outs from avr going to channels 2-6 on mx882 ( im not using the main in's or out's ) then from the outs on the mx882 to each channel on the amps, i have 3 behringer epq 1200 and then to the speakers, is this the correct way to hook up the mx882, the manual doesnt really explain it to well, and it seems with 3 high power amps that it should blow my doors off the wall, but i have the gains maxed out on the amps and the level controls on the mx882 are all set at "0" and for my avr the volume range is between -60 and +15, ( i have a marantz sr7000 ) so any help would be appreciated