vasilisnt
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απο το thread Vinyl vs LP του site της Harbeth
φρεσκες φρεσκες αποψεις του σχεδιαστη και ιδιοκτητη Alan Shaw:
Preference for LP (vinyl) over digital
φρεσκες φρεσκες αποψεις του σχεδιαστη και ιδιοκτητη Alan Shaw:
Preference for LP (vinyl) over digital
I think that the key point is that even if the signal arriving at the cutting lathe is of perfect master quality, due to the sheer mass of the cutting head etc. etc. etc. the lathe itself cannot be expected to make a perfect rendition of that signal. Nor is it ever asked to. The skilled analogue Mastering Engineer has his hand on the volume (and other) controls during the cutting process because he has to be sure that the music will fit the LP side without a break, and he has to be sure that the dynamics are within the range of the average LP buyer's PU cartridge replay capabilities. The primary requirement is therefore not fidelity but the avoidance of LP records being returned to the stores as 'uplayable on my system'.
It is blindingly obvious from the electronmicrograph scan of the LP groove that the groove walls are far from smooth. They should be perfectly smooth, glass-like if they are to even pretend to mimic what is on the master. Since voltage is produced by the cartridge output terminals by the wiggling action of the stylus in the groove, every one of those irregularities will produce an unwelcome voltage which is superimposed onto the music. Hence the constant hash of vinyl due to the stylus wiggle as it slides over the unwanted lumps and bumps.
That said, as I reported a long time ago, I bought my first CD player the day they were launched - a date etched on my memory (3 March 1983 in the UK) and the only available CDs. I was a shade disappointed as I could make the direct comparison between my LPs (via Shure V15/3) and the CD. When the levels were equalised (by ear) on the right tracks the differences were small at a moderate listening level. The give-away was when the music became complex and/or loud when the vinyl was clearly struggling - as you would expect. But LP can indeed sound nice. And it is great theatre too.
There are some interesting things we can observe from a close look at the supplied electron photo of an LP record - see attached.
http://www.harbeth.co.uk/usergroup/showthread.php?1063-Vinyl-vs-CD
It is blindingly obvious from the electronmicrograph scan of the LP groove that the groove walls are far from smooth. They should be perfectly smooth, glass-like if they are to even pretend to mimic what is on the master. Since voltage is produced by the cartridge output terminals by the wiggling action of the stylus in the groove, every one of those irregularities will produce an unwelcome voltage which is superimposed onto the music. Hence the constant hash of vinyl due to the stylus wiggle as it slides over the unwanted lumps and bumps.
That said, as I reported a long time ago, I bought my first CD player the day they were launched - a date etched on my memory (3 March 1983 in the UK) and the only available CDs. I was a shade disappointed as I could make the direct comparison between my LPs (via Shure V15/3) and the CD. When the levels were equalised (by ear) on the right tracks the differences were small at a moderate listening level. The give-away was when the music became complex and/or loud when the vinyl was clearly struggling - as you would expect. But LP can indeed sound nice. And it is great theatre too.
There are some interesting things we can observe from a close look at the supplied electron photo of an LP record - see attached.
- I've marked three adjacent grooves - that's three revolutions of the record, 1, 2 and 3.
- With red arrows I've marked every piece of dirt and rubbish in the groove, every one of which would generate an unwanted noise at the speakers
- I mentioned the skill of the mastering engineer. We can see from point A that had the signal been any louder i.e. the groove fatter, that groove 2 would have broken through into groove 1 at that point - a disaster. Just like a train being derailed by faulty points, there would have been the double jeopardy of severe distortion and groove-skip, with huge return-to-store problems.
http://www.harbeth.co.uk/usergroup/showthread.php?1063-Vinyl-vs-CD
και στην ηχογράφηση και στο εμπορικό προιόν, αν είναι "true", γιατί κι αυτό ανακαλύψαμε τελευταία... :121:
