Powered speakers show audiophiles are confused

@kota1 for reasons only known to you you have issues with me. Feel free to direct message me and rant all you want. Be respectful and don’t make your issue everyone else’s issue as you are doing. It is disrespectful to everyone else here. Only you can make the actions of not making your beef everyone else's problem.

The vertical off-axis responses look wrong.  The vertical drop-off of the top end of the tweeter should be the same or worse than horizontal. 

@erik_squires back when I was in acoustics years ago there was a lot of talk about  frequencies riding on each other. This was when WMTMW was starting and the point was that frequencies were actually interacting nondestructively and preserving high frequencies along the axis of the companion frequencies. This could explain that plot. Sorry if that didn't make any sense. 

@kota1 as I've said before companies like Sony, Yamaha, Harmon and the like can produce anything they want as far as quality tech. I bet someone like you could get someone like the @thespeakerdude to point you in a direction to make a top quality center speaker that you would never get access to otherwise. I would give a lot to have access to experimental prototypes (or notes) that these companies build that will probably be sold in 5 years from now. Of course we know he can't give you direct company info but he can point you in the right direction. Just saying.

OP, looking carefully at the Stereophile measurement plots I think the issue is that the H and V windows are entirely different.

Stereophile uses +- 90 degrees horizontally but a +- 15 degree window for vertical measurements.

Under these conditions the natural tweeter roll off at 30 or more degrees won’t be visible in the vertical plots.  If the GR research video uses the same windows then the same issues will apply.

Normally in the vertical domain speakers perform better in the frequency domain with higher order filters because there's less destructive interference.