On 28 Oct 2005 01:46:45 GMT, "Harry Lavo" wrote:
wrote in message ...
wrote:
Stewart Pinkerton wrote:
Could you explain why you think LP cannot exceed CD in this
category?
It's seledom denied that it has the *capability*, but it's also a
known fact that the reality is rolloff above 12-15kHz to avoid
overheating cutter heads. MFSL half-speed masters may be the
exception.
Amoung those that follow the state of the art of LP mastering it is a
known fact that this simply isn't true and hasn't been for quite some
time. None of the current audiophile mastering engineers are doing this
nor have they been. I suggest you get your facts straight before making
such absurd claims.
My facts are correct,
No they are not correct. just ask Kevin Grey, Bernie Grundman, Stan
Ricker or any other well known mastering engineer.
I don't care what they say. I have your guru Ricker's Cardas sweep
record
and I ran it with several different catridges and preamps through a Lynx
TWO
soundcard running at 192K sampling rate and 24 bits resolution, using Cool
Edit. There is a rolloff starting just over 14K Hz leading to a shelved
response about 5 dB down starting around 16K Hz. ALL the cartridges and
preamps behave in the same way. The record does appear get out to the 30K
Hz
that it claims but it IS shelved down ~5 dB.
Lest you think all my cartridges I tried don't have good HF performance, I
will even list them.
Koetsu Urushi
Denon 103D
Shure V15V
Shure V15xMR
Electro Research EK-1 strain gauge system
Win SDT10 (strain gauge)
Preamps used:
Krell KPE reference
Classe DR5
Two of my own tube designs
The EK-1 is the only setup that gets out to 30K Hz without further
rolloff.
(i.e. follows the apparent shelved response on the disc) The two moving
coils
start rolling off around 25K Hz. The Shures roll off above 20K Hz. The
Win
very slowly rolls off above the point of the shelve.
I thought I wouldn't be posting in this place again, but it would be nice
if
you stopped making this misleading claim. Yes, the record goes out
to 30K. But it is SHELVED down above about 14K. Why? Stewart knows
what
he is saying.
Thanks for the research. Seems to me it all depends....frankly, I'd
take -5db shelved response to 30khz any day over a brick wall cutoff at
22khz. So "George" is right that LP frequency response extends well beyond
CD. And Stewart is right that HF's are cut in power.
In this debate, however, it should be noted that Stewart made no attempt to
explain his statement, and instead gave the impression that there was a
continual rolloff over 14khz. Clearly your data shows that is not the case,
and any rolloff is a function of cartridge design/impedance match once
the -5db shelf has been reached.
Nice try Harry, but as ever, you are skewing the facts to suit your
agenda. Mr Nunes was measuring a *test* record, meticulously mastered
to demonstrate what vinyl is *capable* of at reference level. I was
specifically talking about mainstream music vinyl, not audiophile
specials such as the half-speed mastered MFSL output, which is
certainly capable of extending to 25-30kHz at low level.
I have always acknowledged that vinyl is *capable* of extending out to
30kHz (albeit not at full level), my claim is that available
commercial music vinyl *in reality* rolls off above 12-15kHz. More to
the point, I doubt that this difference from a flat response is
audible on the vast majority of music.
Of course, all this still begs the question of how much musical
content above 20kHz exists in the mixdown master tape, and how much
will be left on the LP after a dozen scrapes..........
--
Stewart Pinkerton | Music is Art - Audio is Engineering