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Re: Burn in Hell

Yah I read that thread with the Green Mountain audio stuff from last week and laughed! Beliefs and facts often don't mix. Guess the knowledgeable person who read all the papers forgot the basic from engineering physics 102. I did not. I'm sure the burning will commence though. Also does not seem to know the difference between acoustic and electrical curves for a transducer. Of course only the electrical curves would ever be published because if the acoustic output curves for phase were published engineering would get a whole lot more obvious. This assumes that any of these companies even COULD measure their transducer phase response, which is dubious at best. Look at frequency response curves and one sees a whole lot of integration to "smooth" the results. One company with an expensive ceramic midrange "smoothed" a 14dB peak at 2485Hz right out of their graph. The old Grapics loudspeaker company used a 30 band EQ between their noise source and test to "smooth" the frequency response for better look. Anybody who has actually tested a transducer knows that if it is +-2dB then it is darned good. As far as time/phase analysis- you cannot map impulse response into time or frequency directly. The most accurate way is to use a two tone system- the same way us antiques used to match the azimuth of the record head to the play head in the days of magnetic tape. I use a special 8 harmonic generator which has all harmonics locked to the fundimental and can measure their phase shift independantly. Tunable over the audio spectrum. TEF machine don't work either for phase. Nor does Malisa or LMS. The very early Audio control Iasys used to work but any later version of the software does not. To many complaints and to much confusion about the coherence results I suppose so the software "smoothes" the results now. Like a lot of things- if you want it right- do it right yourself- if you have the skill.

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