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True to the original Quad ESL
Quad ESL

Electrostatic Loudspeaker Theory

Fikier

A well known work from Fikier which is more focussed on building electrostatic loudspeakers. This dutch classic can be downloaded here. Dutch only.

J.H. Streng

Yet another work by a Dutchman, but this time in English. Theoretical study on charge movements on the diaphragm, radiation patterns and air loading of strip radiators. Download it here

Quad ESL measurements

ESL Simulator

  • Electrostatic Loudspeaker Simulator

Published frequency response measurements

  • Quad measurement Stereoplay June 1978
  • Hifi Stereophonie
  • Unkown source 5db/div
  • Lynn Olson's measurements of the Quad ESL

Some of my own measurements on non refurbished panels

  • Treble panel 6690 vs 6691
  • Treble panel output of mid/high strips
  • Effect of metal front grill
  • Effect of the felt backing on the treble panel
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