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In Reply to: The review was absurd posted by josh358 on September 28, 2020 at 06:03:17:
I'm very wary of all the short-time burst FFTs and other reconstruction techniques to attempt to estimate 'quasi-anechoic' measurements when they are applied to speakers, planars, with driver dimensions which can be significantly longer than the wavelength being emitted. The Klippel system tries to do something with 'spherical harmonics' which is a decomposition for the wave/diffusion equation suitable for systems with certain spherical symmetries, more specifically, the finite-mode truncations (as always used) will work better for quasi point sources vs long line sources. (By the way the spherical harmonic structure & radial modes are the basis of decomposition of Schroedinger equation solutions as the electron wave function orbitals that help govern chemistry)The algorithms & measurements almost surely were NOT calibrated or designed for that situation, i.e. calibrated and validated for planars against results in full, large, expensive real anechoic chambers (which have to be big enough even there so that the long axis of the speaker is still 'small'!) with AES-paper level science.
I'm a hard core 'objectivist' but further we need to be skeptical of the conditions of the measurements and applicability.
Furthermore, these tests, *like all the Harman preference tests*, in single speaker mono. Alone, Magnepans are nothing special. The perceptual psychoacoustic magic happens to me only in stereo, with a difference stronger than conventional speakers, perhaps with spectral balance perceived changes more than box speakers.
Edits: 09/30/20
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Follow Ups
- measurement technology on planars - DrChaos 19:09:59 09/30/20 (1)
- RE: measurement technology on planars - josh358 18:33:59 10/13/20 (0)
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