Because of the distance between your ears , the frequency response when listening to two loudspeakers in stereo should not be flat .
The Harman way of doing this is to simply ignore that there’s always two stereo speakers at normal listening to music , and just concentrate on one speaker in mono - with a flat response. This is correct when you listen to only one speaker in mono.
But what about stereo ?
Below you see two frequency response curves . The curve at the bottom is the ideal frequency response according to the research from Harman , without stereo compensation at listening position 3-4 meters away. We see the boost of bass needed below 100 Hz .
The upper curve in blue shows measurements 1 meters away from one stereosystem compensated loudspeaker . We see a peak centered at 1,7 kHz , Q=3. And a dip at 3,5 kHz .
If using two such speakers in a listening triangle L - R - listening position , the sound with good stereo material will be holografic , free from each speaker and very natural/real sounding .
This can easily be done using a dsp with PEQ function .
The Harman way of doing this is to simply ignore that there’s always two stereo speakers at normal listening to music , and just concentrate on one speaker in mono - with a flat response. This is correct when you listen to only one speaker in mono.
But what about stereo ?
Below you see two frequency response curves . The curve at the bottom is the ideal frequency response according to the research from Harman , without stereo compensation at listening position 3-4 meters away. We see the boost of bass needed below 100 Hz .
The upper curve in blue shows measurements 1 meters away from one stereosystem compensated loudspeaker . We see a peak centered at 1,7 kHz , Q=3. And a dip at 3,5 kHz .
If using two such speakers in a listening triangle L - R - listening position , the sound with good stereo material will be holografic , free from each speaker and very natural/real sounding .
This can easily be done using a dsp with PEQ function .
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And here we see a thread that discusses the paper you seem to be referencing.
https://www.audiosciencereview.com/...nophonic-vs-stereophonic-timbre-change.15829/
It is helpful to let people know if you are referring to a published paper/already discussed topic or if you are just theorizing.
https://www.audiosciencereview.com/...nophonic-vs-stereophonic-timbre-change.15829/
It is helpful to let people know if you are referring to a published paper/already discussed topic or if you are just theorizing.
Thanks for the link 🙂, interesting reading.
In the Swedish forum Faktiskt.io, there have been discussions about stereosystem corrections since the beginning of 2000. The Guru audio constructor Ingvar Oehman is one of the Inventor of the corrections. I show only two of the most important, but in total there are 12 corrections.
Looking at other loudspeaker constructors, the corrections seems to be the inversion of this frequency curve :
In the Swedish forum Faktiskt.io, there have been discussions about stereosystem corrections since the beginning of 2000. The Guru audio constructor Ingvar Oehman is one of the Inventor of the corrections. I show only two of the most important, but in total there are 12 corrections.
Looking at other loudspeaker constructors, the corrections seems to be the inversion of this frequency curve :
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Here is some interesting comparisons from mattstat:s link to audiosciencereview.
The very flat measuring Kef speaker ranks as the best with mono material, but worse with stereo material.
The very flat measuring Kef speaker ranks as the best with mono material, but worse with stereo material.
As everyone knows, perfect stereo listening is only doable sitting exactly at sweetspot, with your head still.
With these stereosystem compensations, everyone sitting outside sweetspot will have slightly worse sound.
However, 30 cm off axis is not much and it also depends on the distance from the speakers to listening position. 30 cm off axis in listening position is not much if its 4 meters to each speaker. But if you sit 1.5 meters from them, 30 cm off is very noticable.
With these stereosystem compensations, everyone sitting outside sweetspot will have slightly worse sound.
However, 30 cm off axis is not much and it also depends on the distance from the speakers to listening position. 30 cm off axis in listening position is not much if its 4 meters to each speaker. But if you sit 1.5 meters from them, 30 cm off is very noticable.