Andre Jute wrote:
The indispensible Phil Allison tells us:

*******
The Quad ESL57 input transformer has an overall turns ratio of 292:1.

The bias voltage on the bass panels is 6.2kV and they require 18 kV
volts
p-p of audio to reach full output.

The bias voltage on the mid/high panel is 1.5 kV and requires 6 kV p-p
of
audio to reach full output.

The Quad ESL63 has a bias voltage of 5.2 kV on the panels and requires
16 kV
p-p of audio to reach full output.

I doubt that Phil ever told such a whopper.
The audio voltage never exceeds the diaphragm voltage.

--
Eiron

No good deed ever goes unpunished.