"Eiron" wrote in message
...
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.

Exception:

http://sound.westhost.com/project105.htm

polarization is speced at 1.5 KV, and maximum drive is 2.5 KV RMS

Other authority:

http://www.geocities.com/quad_esl63/...atic/esl63.jpg

Gives the power supply voltage as 5.25 KV.


The turns ratio of ESL speakers is usually in the 80-100:1 range. The
maximum RMS input of the ESL-63 is given by some as 10 volts RMS. This would
lead to no more than about 1 KV.