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Old 15th August 2019
Lives for gear

And to understand how silly this all is: it is not even only about 500 Hz. Take the fundamental of the female vocal: it will be around 200 Hz or so, the second harmonic can be as low as 400 Hz. Look in the diagram to see that this vocal will be affected.
Sorry, but that's wrong again. Your hearing apparatus does not have much ability to accurately determine direction below 500 Hz. All that you showed was the directivity plot of a speaker, which isn't even a polar plot, and bears no relationship at all to the way we hear and determine the direction that sound came from.

Below are some graphs that show how the actual HRTF function works, and the frequencies that are used to provide that sense of direction.

As you can see, there just isn't much precision at all in the low end. Stereo imaging happens in the high mids and highs, not the lows. Yes, a female singer might be able to get down to 200 Hz, but that's not where most of the energy in her voice is: it's much higher up the spectrum.

So, once again, we get back to the issue: if you move your speakers close to the front wall in your room, and you get degraded stereo imaging, then there's something wrong with the way the room is treated, because the front wall does not affect stereo imaging in a normal room, properly treated, as NSM and others have pointed out.

- Stuart -
Attached Thumbnails
monitor placement-hrtf-frequency-graph.jpg   monitor placement-hrtf-frequency-graph-2.jpg  

Last edited by Soundman2020; 15th August 2019 at 04:49 AM.. Reason: Edited to add the graphs that I didn't include the first time...