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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: Josh read my post below...even your claims through measurements are way off posted by morricab on May 15, 2012 at 14:53:55:
Such a response would indeed sound dreadful. Fortunately for Magnepan's survival as a company, they were actually quite flat. See the always-wonderful Siegfried Linkwitz's letter for an interesting explanation of why Stereophile's measurements were misleading, and the letter that follows. An excerpt:
"Where things fall apart is in fig.3 when you form the complex sum of nearfield measurements and the 50" tweeter 'farfield' measurement. This curve does not represent the frequency response a listener might experience at any distance and is therefore extremely misleading.
"The nearfield frequency response of an acoustic source is only proportional to its farfield response if the source is small, ie, omnidirectional, and if it is in free-space. Summing a driver diameter corrected woofer nearfield response to a farfield midrange response works for a small monitor on a stand, but already has errors when the speaker is larger and the woofer is close to the floor—when the conditions move away from free-space or anechoic.
"The Magneplanar is clearly not a point source and, being open-baffle, it has an acoustic short circuit between front and back. This causes a 6 dB/octave low-frequency roll-off in the farfield response. So from all open baffle nearfield measurements you have to subtract first a 6dB/octave (= 20dB/decade) slope before you can sum the data with other farfield measurements. When you apply this correction to the MG3.6 woofer response you see that it flattens from 400Hz to 60Hz and shows a peak at 47Hz. Similarly the midrange has to be corrected before you can use it for the composite response."
Then check out the more accurate 3.6 measurements that I reproduced in my post.
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Follow Ups
- Morricab read my reply - josh358 18:05:13 05/15/12 (2)
- RE: Morricab read my reply - morricab 03:23:29 05/16/12 (1)
- RE: Morricab read my reply - josh358 05:39:35 05/16/12 (0)
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