First I wanted to add a note about graphs.
Always use LOG and not LIN graphs (click the Freq Axis icon for that).
Use a horizontal scale of 15Hz-200Hz for the subwoofer responses.
Use a verical scale of 45dB-105dB.
Quote:
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can you give me some advice
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Well, I think you first need to establish how your Meridian defines bandwidth and the entry paramaters in BW or Q etc.
This is important because it will determine which equalizer type you'll choose in REW. REW's filter recommendations and entry units are consistent with the mathematics that each equalizer type uses to define bandwidth. Strangely enough, each type seems to have their own idea on how it's defined.
Here are the formulas that are used:
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For the
DSP1124P, the bandwidth parameter is entered as BW/60. It defines bandwidth as:
Bandwidth (Hz) = centre frequency*(BW/60)*sqrt(2)
So, the Q formula becomes:
Q = 60/[(BW/60)*sqrt(2)]
For the
FBQ2496 the bandwidth control adjusts in 1/60 of an octave steps from 1/60 to 5/60 of an octave and is entered in decimal, and so the formula becomes:
Q = sqrt(2)/BW
SMS
The bandwidth is entered as Q and the filter bandwidth in Hz between the half gain points is given by:
Bandwidth = centre frequency/Q
TMREQ
The filter bandwidth in Hz between the half gain points is given by:
Bandwidth = centre frequency/Q
R-DES
The filter bandwidth in Hz between the half gain points is given by:
Bandwidth = 1.766*centre frequency/Q
Generic
The filter bandwidth in Hz between the half gain points is given by:
Bandwidth = centre frequency/Q
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Anyway, you can see the problem there that you need to be aware of. Play around with the different eq types in REW for the same filter and see the different types of bandwidths that are entered and try and match what your processor uses...
brucek