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In Reply to: RE: Measurements do tell a great deal???? posted by stehno on January 04, 2015 at 16:54:42
>JA admitted not long ago that one of his measuring instruments was out of
>production and long overdue for a check up / recalibration.
I was referring to my Audio Precision System One Dual Domain. However,
other than loudspeaker impedance measurements, for which it works fine,
this is now just used as a back-up to my Audio Precision SYS2722. This
is fully up to date and has just been recalibrated at the factory.>I'd have to guess that any such measurements have perhaps a greater
>chance of misleading the consumer rather than revealing truth.I disagree. The article referred to in this thread is now available at
the link below.
John Atkinson
Editor, Stereophile
Edits: 01/05/15Follow Ups:
Thanks, John. However, I still could not see where any standards of any kind were adhered in preparation of or during your measurement recording sessions.
> I still could not see where any standards of any kind were adhered in
> preparation of or during your measurement recording sessions.
For electronics, I adhere to the old IHF standards, except where changing
the measurement conditions reveals something specific about the device
under test that I want to discuss. For loudspeakers, I use a
standardized procedure that I first developed a quarter century ago. See
the link below as well as my 3 articles on measuring loudspeakers at:
http://www.stereophile.com/reference/99/index.html
http://www.stereophile.com/reference/100/index.html and
http://www.stereophile.com/reference/103/index.html .
The only change in all these years was to substitute a chirp- and
FFT-based technique for the original spectrum analyzer technique for
the spatially averaged in-room response measurements. But I have now
published measurements on more than 750 loudspeakers under these standard
conditions, which is perhaps a unique situation.
John Atkinson
Editor, Stereophile
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