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Do I really need the filter at 117.5Hz?
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Since the higher frequency filters (100Hz - 200Hz) are created by REW when dealing with a sub only signal, their effectiveness when mains speakers are added is best left to testing. Obviously, the higher the frequency, the less effect a filter has, since the subs signal is over-whelmed by the mains. The best method is to simply do a sweep with sub plus mains and turn the questionable filter on and off. If there's little or no effect, then remove the filter.
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What will be the best way for me to add a House curve?
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The usual method (when it hasn't been offered as a gift) is to raise the wholesale level of the sub signal with the sub amp and then cut the house curve out with filters. The rub is that you can go too far and lose too much signal level feeding the sub, such that you can't develop full power.
As an example, see the picture below.
If I have a sub filtered with the response marked "75dB target, 60Hz cross, no house", and I raise the level of my sub amp by 5dB, the resulting response will look like the line marked "80dB target, 60Hz cross, no house, equivalent to raising...".
I would like the response to look like the line marked "75dB target, 60Hz cross, 5dB house to 30hz". Simply filter the area marked in yellow.... I think you get the idea..
house curve.jpg
brucek