The best results I have achieved have been based off in room measurements at the listening position. I have tried as many other methods as I can to look for a universal solution and failed. I now have the speakers dead on axis to the listening position instead of 10 degrees off axis. What I found was when the speakers were positioned off axis to the listening position, tuning the listening position to be correct caused the off axis sound to be brighter due to the true on axis direction pointing somewhere else. I did not like the effect this produced. It seems natural to me for the sound to get duller off axis, but odd when it gets brighter.
This is caused by the narrowing of directivity as frequency rises and would be the same in any design with a similar directivity. The more constant the directivity the less of an issue this would be.
This is caused by the narrowing of directivity as frequency rises and would be the same in any design with a similar directivity. The more constant the directivity the less of an issue this would be.