[Scott Dorsey]

Don Pearce wrote:

All this is for naught unless the vinyl record is actually glued to
the platter. The interface will never be tight enough to transfer the
energy adequately through the pair of impedance discontinuities
otherwise. It may, of course touch in a few places, but certainly no
everywhere.

Absolutely. That's why record clamps and weights, combined with a soft
mat, are so important.

To be honest I am not sure what the total contribution of platter ringing
to the system is. My suspicion is that even on the best systems, worrying
about arm resonances will still buy you more improvement than worrying
about platter resonances. But a quick play of the square wave track on
the test record and an FFT analyzer will tell you that for sure.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."