Help with my University Research Project


If you are interested in helping to shape a formal research project (Miami University/Oxford) concerning the effects of wire and electronics on the reproduction of music, then please read further. If anything, you might find my research proposal interesting.

I was a Chemist for a major oil company for a few years and have since quit my job to return to school. I am an Audiophile/Jazz Guitarist and a scientist so much of the HiFi industry goes against my better judgment. However sometimes I cannot argue with my perceptions (they are all we have after all).

I have a friend who is a professor of Physics. His current area of research could be summed up with this statement:

"I am concerned with the mathematics describing the differences in human perception of sound"

While 99% of his work is done with paper and pencil, he does have some very excellent equipment. He is also a music lover (though not really into HiFi) so I have described the "state of the union" with respect to the HiFi industry (he was very intrigued). We have discussed conducting research into this topic:

1. If person (A) sings middle-C, and then person (B) sings the same exact note they will sound different. The pitch is correct but the "tone" distinguishes the two. The reason is that when someone sings middle-C for instant, they are not singing only at the middle-C frequency. Instead what we hear is a combination of many different waves. All of them partially cancelling, partially amplifying one another. In essence there is a distortion around the note. (1st,2nd,3rd harmonics blah blah, lots of math) When a machine records these voices it does not perfectly reproduce the original subtle combination of waves. This is the reason that recordings do not compete with live performances.

Some cables and electronics (tube amps in particular) are inserting a distortion (some more than others) that alters the signal (this is not debatable). Sometimes, as is the case with good tube amps/really goo SS amps, there seems to be a more "real" presence to the music. This could also explain the reasoning behind the theory of "system synergy". By that I mean the matching of components/cables so as to present a more balanced musical presentation. We are postulating that the distortion, with certain component/cable combinations, results in the,(excuse this word), recovery of lost waves. This does not mean that the resulting signal is exactly the same, or that there is not some unwanted stuff in there. We merely suggest that it is the missing waves(distortion) that give music its "real" quality.

Keep in mind that the first step into any research project is to determine what has already been done. So the next several weeks will be devoted toward the reading of countless science journals.

I would like to hear you thoughts about my project, but more specifically, I would like to get a consensus on the attributes of certain component/cable or component/component combinations. For instance, Krell model *?* and XLO model *?* cables produce a *?* sound. I hope to determine a few generally accepted extremes with which to base my experiments on.

Thanks
trthomp

Showing 2 responses by rayhall

I wonder how you intend to deal with issues that very much seem to influence our subjective perceptions of cables and electronics, but which are not related to the areas which you intend to study objectively. Two which come to mind are reproduction of soundstage and reproduction of dynamics. There may be others, such as detail reproduction, but with that one it is not quite as clear that it has nothing to do with spectral balance. I think this brings out the issues related to "objective" testing vs. subjective analysis. Even the so-called "objective" testing is subjective because, even if we had perfect instruments for measuring things objectively, what we choose to measure (and not to measure) make the test subjective. Unfortunately, in subjective analysis, such as listener evaluation, these factors, both those which are understood and those which have yet to be, all contribute to our subjective perception.
I reread carefully your last post as well as the original. I am not a physicist or an engineer, but what I gleaned from your more recent post is that you will attempt to show objectively that there are differences in cables along the lines of whatever you intend to measure or observe with your computer methodology. Then you intend to observe and compile the statements of a panel of listeners regarding what the cables under test "sound" like. I am sure your listening panel will say that the cables sound different and you seem fairly sure that you will be able to show that the cables impart some changes in spectral balance or timing or harmonics which can be measured using your computers. In your original post you say:

We are postulating that the distortion, with certain component/cable combinations, results in the,(excuse this word), recovery of lost waves. This does not mean that the resulting signal is exactly the same, or that there is not some unwanted stuff in there. We merely suggest that it is the missing waves(distortion) that give music its "real" quality.

Let me assume that your computer analysis, if it demonstrates a difference between the two signals (prior to the cable and after the cable), can attribute this difference to "lost waves".

If the listeners identify any differences in cables, as I think they will since I hear them, I don't think there is anything in the way this experiment is designed that will allow you to attribute the differences which the listeners describe to the "lost waves".

My last statement, I think, is the point of your last post. But it seems to me that all scientific experimentation starts with a hypothesis or, as you described it in the paragraph which I excerpted from you, a postulation. Yours is contained in the last sentence of that which I excerpted. Hopefully you will get there, perhaps with follow-on experiments, but what we really need in audio is not simply more standardized testing as you state in your last post, but more proof that the characteristics being measured, varied or "improved" do contribute significantly to our perception of the quality of the sound. If you can demonstrate that, your contribution to audio will be quite significant and the industry will likely adopt your standards for measuring cables as well as other audio equipment.

I do wish you luck, not because I am tired of listening to cables in order to determine which I think is best. That is, after all, my hobby. I am tired however, of the pseudoscience and advertising "rhetoric" which exists in the audio industry and anyone who is seeking to establish any objective measure of what we agree sounds correct, no matter how difficult this is to accomplish, has my support.