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Proper Q for room modes

ahofer

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I've searched around a bit here and haven't seen a thread specifically on EQ for room modes. There's some guidance on the internet that suggests a Q of up to 15, which seems pretty peaky.

Just for fun, I've created a competing EQ to my convolution by just using the suite of measurements I took in the room and taking out the room modes manually (first in Roon, but then I will recreate it on my RME Dac so that they work when I play Idagio. The largest room modes are at 28 and 66, per measurement. It seems the Q ought to be narrower at lower frequency. It's interesting that the convolution file does not look like this (attached at bottom), and gives a more recessed presentation.

(OK, in the manual EQ I also took out a little dip in the 3k area that arises from my Harbeths' drop in dispersion around that area)

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Here are some of the key measurements, which are quite consistent from sweep to MM and left to right.
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convolution (L then R)
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fpitas

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I EQ the old-fashioned way, namely measure, save a sweep, then try a notch filter and re-sweep until it flattens the peak without taking anything else down. I usually end up with a Q around 12, but I'm sure it depends on the room furnishings etc.
 
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