Inner Groove Distortion Reply #25 – 2010-09-14 13:23:58 Quote from: doctorcilantro on 2010-09-13 13:54:55I understand you can't write a dissertation and it's fair to summarize your experience with these technicalities,The technical details related to vinyl production and playback were pretty thoroughly discussed in the JAES amd IEEE journals back in the day. Thse articles are in the respective archives for posterity. Trust me, all of the reasonable technical alternatives were flogged to death before the decision was made to scrap vinyl for mainstream use. Quotebut it seemed to me (most likely simply as a result of my ignorance on these matters compared to you) you had wrapped everything into vinyl = distortion = bad. I understand vinyl has very real and measurable defficiencies, I just wonder how audible these defficienices are.It is impossible to produce and playback a recording using vinyl media and have something that is very close to audibly facsimile reproduction of the origional recording. It is easy to accomplish the same thing with 44/16 digital. While high speed wide track magnetic tape comes far closer to facsimile reproduction than the LP, it is still possible to distinguish one generation of analog tape in an ABX test. QuoteWhat are some of the systems you have used or tested in the last 20 years?I decline to answer such questions because vinyl advocates can and will usually dismiss any reasonable and even many unreasonable vinyl playback systems as being inadequate based only on myth and rumor. QuoteSo tracing distortion and pinch effect are aggravated at the inner grooves; for "music" or a sine wave?Music is just a collection of sine waves. If its bad for sine waves, its bad for music.QuoteIs it true as the groove speed decreases distortion rises?Yes.QuoteThe wavelength shortens, and coupled with shape of the "inadequate" playback stylus, we get tracing distortion?Yes. This was well known and documented in the 1960s. Nothing has signficantly changed since then. We still don't play records with cutting styluses for pretty obvious reasons. We may or may not have playback stylii that are better approximations of the cutting stylus, but that approach can't compensate for the fact that the vinyl springs back after being cut, and always has a shape that is different from our intentions.QuoteIs this audible enough to detract from the fidelity in a meaningful way given an optimized setup (contact line stylus, tangential tracking). Many modern records, on 2 LPs seem to be cut a 10 minutes per side, or cut at 45rpm (which I assume would help?)If you measure the may different at are inherent in vinyl production and playback, they are large enough so that they look on paper like they would be audible. If you simulate them, they are audible. If you try to ABX vinyl playback and the origional recording you will be able to hear a difference in almost every case you try. Most extant recordings on vinyl were produced using magnetic tape, and audible flaws were introduced to the process before the LP was cut. Cutting and playing back the LP is even worse than analog tape. My point is that facsimile reproduction was lost before the vinyl was even cut. That all said, vinyl sounds pretty good given how bad it measures. And measurements do matter, when used and judged intelligently.