On Thu, 28 Oct 2004 14:20:18 +0100, "Dave Plowman (News)"
wrote:

In article ,
Arny Krueger wrote:
So far we've been told that the holy grail in turntable platters is
either glass or plexiglass. These are very different materials. The
fact that the parameters of a 100 year old technology can't be nailed
down any better then this is indicative of how much ******** rules the
world of vinyl playback engineering.

A disc with a pickup resting on it acts rather like the diaphragm of a
microphone. Anyone who ever had a Transcriptors's design will be well
aware of this.;-)

So it seems only common sense to me that the disc must be isolated from
vibration of any sort - either structure or air borne. Including those
from the speakers. This must involve some form of heavy cover to the
entire turntable assembly.

Not if the disc is clamped to large mass of mechanically compatible
material - such as vinyl or acrylic.

--

Stewart Pinkerton | Music is Art - Audio is Engineering