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In Reply to: RE: recorded from vinyl posted by John Elison on September 27, 2015 at 10:04:29
I'd be willing to bet that the only way vinyl can contain frequencies past 20-kHz is if the vinyl is half-speed mastered. I'd be willing to bet that cutting lathes pretty much hit a brick wall at 20-kHz. Therefore, half-speed mastered vinyl might very well contain music frequencies past 20-kHz if the master recording contains them. Unfortunately, direct-to-disc records cannot be half-speed mastered because they are recorded in real time.
Best regards,
John Elison
Follow Ups:
MoFi Waiting For Columbus is half speed mastered. Musicscope claims content over 20kHz but I'll never hear it @ -90 db.
There is really no need for frequencies above 20-kHz because nobody can hear them anyway. Some audiophiles believe that just because they can't hear those frequencies when isolated and played alone, they can all of a sudden hear them when music is playing. I don't believe that. All frequencies above 4-kHz are basically music harmonics, which occur at lower levels than music fundamentals. Moreover, higher order harmonics above 10-kHz occur farther and farther below the level of music fundamentals. In other words, higher order harmonics become lower and lower in intensity compared to the fundamental that produced them. Therefore, if you can't hear these frequencies when isolated and turned up loud, how could you believe you will all of a sudden hear them when they are masked by music fundamentals that are 20-dB or 30-dB louder than the harmonics. That's totally illogical in my mind.Anyway, I said that half-speed mastered LPs might contain those higher frequency harmonics. They have to have been recorded in the first place, which means the tape recorders and microphones had to be flat to 30-kHz, which is unlikely but certainly possible.
Best regards,
John Elison
Edits: 09/27/15
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