sony sa-h7900 one esl quieter please help

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coating is screwed on one of the panels... most likly.

or it could be the amp that drives them. you can unscrew the front and swap the electrostatics with the other one , if the panels still plays softer on the other speaker. i bet its the coating.. i think you could easy get the panels appart as i remember and recoat them if needed.
 
If i remember corectlly you can unscrew them and coat them without destroying the mylar.

but try swapping them first left for right and other way around. before doing any coating to know for sure its not the amplifier transformer or Highvoltage cascade.
 
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