On 26 Oct 2005 02:41:56 GMT, "Iain M Churches"
wrote:

"Stewart Pinkerton" wrote in message
...
On 22 Oct 2005 17:27:18 GMT, "ScottW" wrote:

" wrote in message

extended FR, it all

Could you explain why you think LP cannot exceed CD in this category?

It's seldom 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.

Sorry Stewart but what you refer to as a known fact is neither
known or factual, but totally incorrect. Such a statement reveals
your lack of knowledge of practical disc cutting, although it
probably suits your anti-vinyl agenda:-)

Actually, your attitude reveals a refusal to accept general practice,
but suits your valves 'n vinyl agenda.

We have discussed this matter at great length before.
Helium is used as and when required to cool the cutter-head.
Neumann, Lyrec, Westrex and Decca cutterheads all have an
hf response 22kHz.

But not at full output.

Decca have a test record with glide tones 20Hz to 20kHz,
used to set up RIAA replay chains in disc cutting suites,
control and listening rooms.

One must of course *start* with a flat response, before applying the
necessary compression, limiting and rolloffs which are fundamental to
vinyl mastering. Of course you know all this.............

No doubt other cutting facilities, EMI CBS etc had
something similar.

No doubt they all produced vinyl with the same fundamental limitations
at both ends of the spectrum.
--

Stewart Pinkerton | Music is Art - Audio is Engineering