"Don Pearce" wrote in message
...
On Tue, 1 Aug 2006 16:32:38 +0100, "Paul" wrote:

snip

It is neither a bodge nor a fix. It is a way of using a resource that
would otherwise be wasted - high frequency headroom. An exactly
matched amplitude/phase curve is exactly equivalent to flat frequency
and phase, and there is no problem whatever in making that match.

Are you telling me that an RIAA filter is optional for vinyl?
My understanding is that it is a prerequisite and that it has to be employed
because it is impossible to cut a groove at high frequencies (perhaps even
low frequencies). The same being true for retrieval - a stylus simply could
not track it accurately even if it could be cut. Without it's use, the vinyl
experience would be appalling.
I believe that, because of the limitations, information is
compressed/omitted/converted or whatever and reconstituted in the amp. Am I
wrong here? I am more than happy to be told when I am wrong. If I am
correct, it is a bodge etc put in place to overcome limitations.


And do remember that the CD specification includes the option to use
pre-emphasis.

But is it used? More to the point, as it is optional, it is clear that it
isn't necessary.

Paul