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RE: "extending the lower bass of the panels" ...
Posted by josh358 on March 20, 2017 at 16:20:10:
They spec'd the measurement at 100", though. That isn't near field. And if they tried to gate it at that distance to make it quasi-anechoic, they screwed up *unless* they were outside or in a huge space in which the reflections were outside the window.
Some other wrinkles -- if the gating is too short, you won't get a contribution from the full height of the line source or the floor and ceiling reflections that you do want. And if you do it outside, you won't get a contribution from the ceiling reflections.
Just very hard for these reasons to do meaningful quasi-anechoic or even anechoic of a planar. What counts is the in-room response -- and then you have to accept that bass levels vary widely between rooms and speaker/listening position.
Sounds like an interesting white paper. I remember Pass saying that he tries to mimic the harmonic distortion of the air but I'm afraid I'm missing the effect of device linearity -- that's what feedback is for. Of course you'll hear effects of feedback such as the adverse effect on the harmonic spectrum, but I'd expect the feedback to take care of obvious effects of the magnitude I was hearing. That I think is too high for the harmonic distortion spectrum of a modern amp, usually what I hear of harmonics is subtle except for crossover notch distortion and this didn't sound like that to me.