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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: beaming posted by A.Wayne on February 29, 2016 at 14:44:11:
That is an unlikely cause since beaming is a dispersion issue and a property of the speaker geometry. In the Spectra 4400 vs the 2+2 the top end is not played by all the panels.
Where you may be right is in there being a phase contribution to beaming - usually off axis, but I don't see how the phase relationship would change that differently between frequency ranges by the amp alone - though severe and badly implemented feedback as is common in SS amps might do so because of propagation delay in semiconductors and the presence of stray reactive components within the feedback loop.
The only class D amps where I am aware of the designer being careful to track and minimize propagation delay and to correct for phase distortion that can result is the Spectron Musician (at least for version III) . In SS amps, Nelson Pass pays attention to this in all his designs (or at least lip service) and particularly with the FirstWatt non-NFB amps. Ayre and Simaudio/Moon also restrict feedback for those reasons in their SS amps. Devialet and NAD in their Masters series class D amps claim to use DSP to compensate for the phase characteristics of their amp sections. The Devialet definitely seems to do so as successfully as do Spectron.
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- RE: beaming - Satie 00:33:43 03/01/16 (0)
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