Wayne Stallwood wrote:
On 07/08/11 18:56, Anthony Anson wrote:
My information is that on tests, LPs were played continuously - well, allowing for autoreturn of stylus, continually - for a year, and little wear was evident, and there was no detectable difference in frequency range.
I'd love to read about this, do you have any links or article references or something you can scan in for me ?
'Fraid not - this was something I read during the last century in some trade mag - probably Hi-Fi News or the other one - the one we considered better, whichever that was, My memory is forty, you know...
If someone has cut a record with more headroom than 20k then I would be interested to hear about it and even more interested to hear how many plays that extended headroom lasts for and what pickup and phono stage is capable of reproducing it. RIAA figures for frequency response vs number of plays are scary but I presume are assuming a fairly low standard of playback equipment as they talk about something like 13khz after 30 plays ! I am sure with well set up and good quality equipment this can be more than slightly bettered.
ITYF that CDs' frequencies are considerably below vinyl's at the high end, and above at the low.
Well I am reading this straight from the Red Book which a player and the media needs to adhere to in order to display the "Compact Disc, Digital audio" logo.
So if you think I am wrong then please provide some references. Either ones that show that no player adheres to the red book or that vinyl is somehow reliably capable of greater than 20khz (there is no theoretical limit to the bottom end at the media level on a CD naturally although naturally there may be one imposed by the analogue side of a specific player or when mastering a specific disc) 20hz seems common.
I base my comments on what I have read in technical articles in hi-fi mags, mainly, aided and abetted by exchanges on Usenet.
I suppose I shall have to see what I can extract from some old HDDs if you are really keen to check sources. It'll do me good - I've never used the external HDD reader thing I bought a couple of years ago for a similar purpose,
The technical limit at the top end of CD Audio is naturally the folding frequency of the sample rate which is fixed by the standard at 44.1khz. Now many players quote 20khz I think due to a bit of analogue filtering to hide quantisation and jitter and of course depending on the source material there may be further limits at the mastering stage..but this is common to all formats, if the 24track that recorded it was only capable of 16khz then that's what you will get regardless of the format in which it is presented.
I think in order to preserve the sanity of the rest of the list any further conversation should be done offlist.
Oh, I don't know - they ^may* find it instructive. I'll have to look at some old newsgroups so I can get a date to set the pooter to - or the newsitems will die if I haven't unflagged autoexpire on them. What's the position with Deja News these days?