Digital Drive

RE: Your challenge is

77.59.161.90

morricab

D

In Reply to: RE: Your challenge is posted by E-Stat on June 19, 2024 at 16:38:42

Indeed. Cheever also came up with a metric that included SPL because the ear/brain masking extent (i.e. what harmonics and how much) changes with SPL.

This is why low SPL is more critical than high SPL because masking is less effective, particularly for high order harmonics even at very low levels. They also tend to be about the same regardless of amp output in a feedback type amplifier. It is also probably why low level resolution and soundstage/imaging are most affected by the negative effects of high order distortion and negative feedback.

Follow Ups:

I'm sorry for the two of you, but the critical observation Geddes made. . . - Chris from Lafayette 17:02:12 06/23/24 (1)
. . . was that even INDIVIDUAL subjective perceptions of sound can change from day to day or even hour to hour FOR THE SAME PERSON perceiving the same sound.

How are you going to account for that - and then "quantify" it? It seems to me that the only option you have is to do so in a faux scientific way - by arbitrarily assigning "values" to reactions which cannot by their nature be quantified.

The two of you try to denigrate listeners who set some store by measurements (and not just THD!), and yet you then turn around and quote these "scientific" study measurements which are IMHO pretty dubious.
- RE: I'm sorry for the two of you, but the critical observation Geddes made. . . - morricab 02:58:14 06/28/24 (0)
  You clearly haven't heard of statistics...think about it or read about it and it will perhaps come to you eventually how you can get some useful data out of individual preferences.
  
  As to the industry, they provide the measurements they kind of have to, not the ones that would be useful (if fitted with the proper model). They publish THD and maybe IMD...almost no one provides a detailed FFT and model fitting. Aries Cerat provides the level of H2 and H3 at a given power...but that is an exception rather than the rule and the assumption they make is that there is an exponential decay in the harmonics with increasing harmonic order.

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