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In Reply to: RE: "extending the lower bass of the panels" ... posted by Satie on March 21, 2017 at 08:27:12:
He's wrong, though. For the typical planar, 100" isn't near field, it's medium field -- on the border of the near and far field, which is to say it's near field at some frequencies, far field at others. This is very apparent when you look at a plot of dispersion as a function of both distance and frequency.
"Quasi anechoic" just means the measurement has been gated to suppress room reflections and at that distance in the typical room you *can't* gate out the reflections. Unless he measured outdoors, but then it would likely be described as an outdoor measurement and would include the reflections from the ground -- which are actually crucial to the LF response of a dipole since they effectively double the baffle size.
I seem to remember having read Pass on the harmonic distortion of the air some years back. The man is an artist. On the other hand, high order harmonics sound more dissonant and have to be weighted in a harmonic distortion measurement because they're a good deal more audible. One of the main arguments against high levels of negative feedback is that the distortion spectrum changes to emphasize higher-order harmonics. They really should dispense with THD and use the formulas for audibility to create a meaningful weighted measurement. It would take into account both the relative audibility of the harmonics and the Fletcher-Munson curves.
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Follow Ups
- RE: "extending the lower bass of the panels" ... - josh358 13:13:17 03/28/17 (0)
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