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In Reply to: Re: Not necessarily by any means (nt) posted by morricab on February 25, 2007 at 03:54:26:
You assume the full range, single panel electrostatic's diaphragm is pistonic, along with certain other requirements for time and phase accuracy. These are design goals which may or may not be fully realized. It likewise is not necessarily true that a first order crossover speaker with a stepped baffle is time and phase coherent.If you look at some of the step response graphs from Sphile, you will see that some of the multi way Meadowlark and Thiel speakers have much better right triangle shapes than, say, this Quad does.
However, the Quad is still better in terms of these graphs, for obvious reasons, than a high order crossover speaker. Phase shift is not an entirely black and white phenomenon - most designs concerned with it try to minimize it over the midrange frequencies.
>The Quad's impulse response on the mid-panel axis (fig.6) suggests a time-coherent presentation, with some high-frequency ringing evident. The step response (fig.7) has an almost perfect right-triangle shape, disturbed by what must be a reflection of some kind about 300;us after the initial arrival of the step, and again some high-frequency perturbations. These show up as ridges of delayed energy at 8kHz and above in the cumulative spectral-decay plot (fig.8).
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[a little off the topic because he's speaking of the measurements in general] >You can find my 13-year-old measurements of the ESL-63 online. Though the measurements were performed with completely different hardware to those for the '989, those graphs are almost identical to and as enigmatic as are these measurements of the ESL-989. All I can say is that the reasons for this speaker's undoubtedly superb sound quality are not readily apparent from its measurements. I hope to explore this subject in more depth in a follow-up.
http://www.stereophile.com/floorloudspeakers/720/index7.html
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- Re: Not necessarily by any means - suits_me 14:19:34 02/25/07 (0)
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