Ok - I'll look that up and see if I can make sense of it.
That's interesting about directivity. The anechoic response must matter somehow though, I would think. I talked with somebody some time ago who had designed a speaker that sounded great in the room he designed it in, but terrible in other rooms. He had unknowingly made a speaker that combined with that room's imperfections to create a neutral response in it. But that didn't translate well to other rooms.
We don't have measurement equipment - we listen to test tones and sine wave sweeps. The speakers are 41 1/2 inches from the wall behind them, 4 feet apart (toed in a bit), and our listening position is about 11 feet from them. The things that I notice particularly are that the speakers go lower before rolling off - in the PIR they seem to roll off around 70hz, but they sound pretty flat down to the mid-high 40's - and we don't hear that large decline from 700Hz to 4Khz.
We may not hear things as accurately as microphones, for sure, but we're careful listeners (I scored 9/10 on a test for hearing 1db differences), and I think we'd be able to hear a 5db drop like that.
Ours are the NrT dome Towers - that may explain some of it.
No worries, I understand you're busy - thanks for taking the time to respond to my post.