IM Distortion, Speakers and the Death of Science


One topic that often comes up is perception vs. measurements.

"If you can't measure it with common, existing measurements it isn't real."

This idea is and always will be flawed. Mind you, maybe what you perceive is not worth $1, but this is not how science works. I'm reminded of how many doctors and scientists fought against modernizing polio interventions, and how only recently did the treatment for stomach ulcers change radically due to the curiosity of a pair of forensic scientists.

Perception precedes measurement.  In between perception and measurement is (always) transference to visual data.  Lets take an example.

You are working on phone technology shortly after Bell invents the telephone. You hear one type of transducer sounds better than another.  Why is that?  Well, you have to figure out some way to see it (literally), via a scope, a charting pen, something that tells you in an objective way why they are different, that allows you to set a standard or goal and move towards it.

This person probably did not set out to measure all possible things. Maybe the first thing they decide to measure is distortion, or perhaps frequency response. After visualizing the raw data the scientist then has to decide what the units are, and how to express differences. Lets say it is distortion. In theory, there could have been a lot of different ways to measure distortion.  Such as Vrms - Vrms (expected) /Hz. Depending on the engineer's need at the time, that might have been a perfectly valid way to measure the output.

But here's the issue. This may work for this engineer solving this time, and we may even add it to the cannon of common measurements, but we are by no means done.

So, when exactly are we done?? At 1? 2? 5?  30?  The answer is we are not.  There are several common measurements for speakers for instance which I believe should be done more by reviewers:

- Compression
- Intermodulation ( IM ) Distortion
- Distortion

and yet, we do not. IM distortion is kind of interesting because I had heard about it before from M&K's literature, but it reappeared for me in the blog of Roger Russel ( http://www.roger-russell.com ) formerly from McIntosh. I can't find the blog post, but apparently they used IM distortion measurements to compare the audibility of woofer changes quite successfully.

Here's a great example of a new measurement being used and attributed to a sonic characteristic. Imagine the before and after.  Before using IM, maybe only distortion would have been used. They were of course measuring impedance and frequency response, and simple harmonic distortion, but Roger and his partner could hear something different not expressed in these measurements, so, they invent the use of it here. That invention is, in my mind, actual audio science.

The opposite of science would have been to say "frequency, impedance, and distortion" are the 3 characteristics which are audible, forever. Nelson pass working with the distortion profile, comparing the audible results and saying "this is an important feature" is also science. He's throwing out the normal distortion ratings and creating a whole new set of target behavior based on his experiments.  Given the market acceptance of his very expensive products I'd say he's been damn good at this.

What is my point to all of this?  Measurements in the consumer literature have become complacent. We've become far too willing to accept the limits of measurements from the 1980's and fail to develop new standard ways of testing. As a result of this we have devolved into camps who say that 1980's measures are all we need, those who eschew measurements and very little being done to show us new ways of looking at complex behaviors. Some areas where I believe measurements should be improved:

  • The effects of vibration on ss equipment
  • Capacitor technology
  • Interaction of linear amps with cables and speaker impedance.

We have become far too happy with this stale condition, and, for the consumers, science is dead.
erik_squires
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The neurons in our brain are very low precision. In all your examples, you equated sensitivity with precision and they are not remotely the same thing.
Precision is something that can be attributed to a measurement process...

Sensitivity something attributed to the instrument itself, relative to some "precise" range threshold measurement...


 Therefore they are linked....

Your remark makes no sense whatsoever...  


a non biological device that can repair or reconfigure itself.
The theory of self replicating machine is 70 years old and come from Von Neumann....

A self replicating automata is not necessarily intelligent...

I cannot explain to you my "artificial soul" theory....Because you really think that machine can replicate life then having "soul".... Or real intelligence...Your faith is not mine....And remember that Science is evolutive faith nothing more except for superstitious man...


I am just the only person in this thread not applying magical properties to biological "things"
Another non sense, do you know how biology and chemistry are dependent on quantum mechanics ?

You think that a living system is made of " matter" ? You lived in the wrong century...

If quantum mechanic is not in a metaphorical way "magic" then why Feynman say that someone who understand quantum mechanic is a  lier?

All living systems are "magical" in the sense that they are not reducible to the second law of thermodynamics Schrodinger think precisely that....


Their source of information are complex and not only analog or digital but symbolic and more than that the source of information for all living system is the same, this fact guide Schrodinger to think that consciousness is an absolute singular and that all consciousness are linked together like the angle of a one circle....


But Schrodinger is a crank probably.... :)

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