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I don't understand how the fronts are producing 87 or 88 db at the 30 thru 70 range and even 77 at 20
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Well, somethings wacky for sure. Even on large I can't imagine your P-100's producing that response. The low end of a P-100 is 39Hz +/- 2 dB. I know this because I use a set for my surrounds.
The processors crossover settings would be where I would first be looking for a problem. Something is just not right if you have a small setting at 80 and you are producing that graph.
Perhaps your measurement technique is incorrect. What Radio Shack meter calibration file are you using? What model of the three meters do you have? You need to use the correct file for the specific meter.
You should use our excel measurement tool and tones found
here perhaps. See the BFD Microsoft Excel worksheets and use the correct worksheet for the meter model you have. All the cal files are built into the worksheet.
You can buy a BFD at most musician supply stores such as
here. I'm not recommending this place specifically, it was just the first google match.
The BFD acts as a simple two channel equalizer at line level between the processors sub out and your subwoofer. There are 12 filters per channel. You just use one channel if you have one subwoofer. See the
Guide for a deeper explaination..
brucek