Measurements for electrostatic headphone amps? (or energizers)

[Fluffy]

I really appreciate the good work been done in this site in measuring headphone amps. I am interested in electrostatic headphones, but the problem is there is not much solid information about which amplifier performs objectively better. Stax, for example, sells a whole range of energizers that look pretty much the same, but have drastically different prices.

Are there measurements anywhere of amplifiers\energizers for electrostats? If not, then how come?

 

[RayDunzl]

Are there measurements anywhere of amplifiers\energizers for electrostats? If not, then how come?

The voltages produced may have something to do with it...

https://www.head-fi.org/threads/electrostatic-amplifiers-voltage-ratings.582518/

"3000 volts peak to peak stator to stator (+/-750 power supplies)
KG TOGTE

2400 volts peak to peak stator to stator (+/-600 power supplies)
koss esp950

2300 volts peak to peak stator to stator (+/-575 power supplies)
KG’s new Silicon Carbide jfet based space heater.

2000 volts peak to peak stator to stator (+/-500 power supplies)
Stax T2, DIY T2, KGSSHV (ixys parts)

1800 volts peak to peak stator to stator (+/-450 power supplies)
KGSSHV (sanyo parts)
craig has said his new electra amp does 1800 volts, power supply unknown
Ergo Jecklin "

and so on...

 

[Fluffy]

Ok, but if they can make headphones that run with these voltages, then it should be possible to build a measuring device. In the end these are just audio electronics, and they need to obey the same standards as all audio equipment – frequency response, distortions, noise to signal ratios, channel matching, etc. I'm sure the people who build them can measure them, can't they?

 

[Gnasherrr]

The voltages produced may have something to do with it...

https://www.head-fi.org/threads/electrostatic-amplifiers-voltage-ratings.582518/

"3000 volts peak to peak stator to stator (+/-750 power supplies)
KG TOGTE

2400 volts peak to peak stator to stator (+/-600 power supplies)
koss esp950

2300 volts peak to peak stator to stator (+/-575 power supplies)
KG’s new Silicon Carbide jfet based space heater.

2000 volts peak to peak stator to stator (+/-500 power supplies)
Stax T2, DIY T2, KGSSHV (ixys parts)

1800 volts peak to peak stator to stator (+/-450 power supplies)
KGSSHV (sanyo parts)
craig has said his new electra amp does 1800 volts, power supply unknown
Ergo Jecklin "

and so on...

what is a togte? i have never seen this on headcase.

 

[WHO23]

Hi guys! I just found an old Japanese site with measurements for electrostatic headphone amplifiers <https://seesaawiki.jp/w/funya2420/>

(The dB figures are from eyeballing the graphs on the site. For the frequency roll off I counted the pixels)
(Edit: Changed DNR to A-Weighted)