So that makes me believe the signal from 670 is hitting the wall, getting reflected and hitting the unit. Then I blocked with my hand the side of 670 towards my unit, to make sure it did not work because of the supposed wide angle of the 670 LED, it still continued to work. Then I pointed my 670 45 degrees off, it worked. I pointed One 45 degrees off, it did not work.
My opinion is, it is the strength of the IR signal is the issue, not the angle.