Dange, I don't understand what you are saying.
Both of us certainly can play around with 'windowing' to achieve results such as the following.
However by using the controls to see an audibly significant result we get this.
Looks like up to a 2dB improvement in a small frequency area. IMHO not useful enough to put up with a 2x4 panel standing where my keyboard and mouse normally are.
Lupo's earlier broadband figures showed exactly the same as my first test.
Quote:
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-47.247dBFS RMS and -47.498dBFS RMS respectively. 1/4 dB change on full bandwidth sweep.
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Here it is pretty easy to see how one might say 10dB of energy has been removed by the panel.
Overall I am going with the 2dB third octave view. Not enough to put up with a very inconvenient panel, in my room not even possible.
I have tested panels behind speakers with a view to diminishing SBIR. I got no measureable improvement. The popularity of the practice, particularly at GIK has prompted me to do these tests again sometime but for now my test stands.
DD