Rob wrote:

Roger Hayter wrote:
Brian Morrison wrote:

On Sat, 27 Oct 2018 12:59:58 +0100
Gareth's Downstairs Computer
wrote:

Interesting thread over in rra.boatanchors suggesting that
ceramic capacitors' capacitance is voltage sensitive and
thus responsible for distortion in the audio path.

Well known in SM caps with higher dielectrics, it's essentially a
piezo-electric effect.

Noticeable in PLL loop filters, a voltage transient on a tuning step can
be considerably extended and in extreme cases will be microphonic.

I was under the impression you shouldn't use them in the signal path,
just for bypassing. More expensive and bulkier technologies are needed
for big signal capacitors.

The true purist does not use capacitors in the signal path.
All DC-coupled amplifiers.

For communication purposes (and for any real speakers) then you need a
massive HPF to make the signal usable.

--

Roger Hayter