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The reason I started to look at EQing the subs is because one of my sub drivers is bottoming during heavy passages. So I am hoping to incorporate a subsonic filter in my Eking with the BFD. Is this possible?
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No, you can't fashion a high pass filter with the BFD.
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A simple REW test of each sub shows a lot of output below 20Hz.
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They both show usable output to about 15Hz. The signal below that is noise. REW tends to compensate down low since you have the C-Weight box checked (as the C-Weight graph drops, the noise signal rises. Uncheck it, since you have a cal file loaded.
It would help out if you used the standard axis of vertical 45dB-105dB and horizontal 15Hz-200Hz. It makes it easier for everyone to read. Also uncheck the soundcard cal and meter cal to remove the lines from the graph.
brucek