Re: >20kHz content found in vinyl? Reply #25 – 2017-06-08 19:37:58 DVDdoug and Cavaille, thanks for your comments. If you only read my last post and left out the rest of the thread, it might not have been so clear what I was asking - or maybe I wasn't being very clear to begin with.So, I'll spell it out here:The wiki on vinyl myths includes the two bullet points I mentioned in my last post. We should strive to only include something in the wiki that can be backed up by actual proof of some sort. What I'm advocating for is that either someone, preferably the person who submitted those two points to the wiki, should show us some realiable source for this (as mentioned earlier, I hadn't been able to find any by a quick Google search), or those two points should be removed from the wiki altogether.As for your vinyl albums, Cavaille, as I've mentioned earlier, it's my belief that most vinyl albums are cut using a low-pass filter that cuts off the highest frequencies. So the source material might contain supersonic frequencies, but a low-pass filter cuts it off. It varies where the filter starts cutting off, but usually between 15 to 18 kHz is my impression (just an impression). Even the world's biggest CD hater (Michael Fremer) admitted to the use of this filtering (when pressed).Quote from: DVDdoug on 2017-06-07 21:31:23Quote* Vinyl records commonly (not occasionally) contain musical content (not noise or distortion) up to 23-24 kHzIf you can't hear it, it's not "musical".... It's not even sound...Without having the master tapes (or digital masters) you can't possibly know if any noise/harmonics were generated as part of the vinyl production/playback process or if they were present acoustically or generated somewhere else in the production chain. It could also be helpful to know what filtering was used ahead of the cutting lathe.I made more or less the same point previously. We need actual proof that what is on the vinyl records at 23-24 kHz is actually music and not noise. But even though we can't hear it, it is possible that it is actually musical content - just like the supersonic musical content on certain hi-res files. Personally, I have no interest in hi-res at all (and can't hear the difference), but I'm striving for an accurate wiki on this topic. Just to be clear: If somebody can actually show us proof of the claims, then they should of course be allowed in the wiki.