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In Reply to: RE: recorded from vinyl posted by Mr_Steady on September 27, 2015 at 08:23:51
Not Sheffield Lab! None of Sheffield Lab's direct-to-disc records were designed for FM radio. They were designed for audiophiles with high-end audio systems. The thing is, microphones and cutting lathes roll off fairly quickly after 20-kHz. Most importantly, the human ear doesn't hear anything past 20-kHz and many of us older folks can't hear anything past 10-kHz. On the other hand, I still believe that well mastered high-resolution digital sounds better than 16/44 Redbook. Therefore, there must be some reason other than high-frequency response that's responsible for the improved sound quality.
Best regards,
John Elison
Follow Ups:
John I agree with everything you wrote in your two posts.
I think originally DaveK and then rrob had points about the song Fugue, and their posts had to do with the limited music content shown on the graphs. Now I agree with their view, and it surprises me how such complicated keyboarding can only generate such a little spectra on the graph. That is a learning experience to me.
About high frequency sampling. General wisdom is that it allows you to target your high frequency filter up higher, so you don't hear it as much. Ringing or pre-ringing, or something. Also an argument for DSD, because it's filter consists of a single capacitor. Just a simple first order passive crossover. From my experience with SETs I can tell you loosing one or two caps in the signal path can really open up the sound. Strange but true. I've read that a higher frequency sampled also translates into more samples per second, and I think that has something to do with an increase in sound quality. More samples per second means a more accurate reconstruction of the original analog waveform. I would think.
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Big speakers and little amps blew my mind!
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
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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