ESL speakers are based on very high voltage biasing and step-up transformers that convert signal from amplifier to high voltage signal driving stators.
Before opening an ESL, it is essential not to say vital to let the speakers unplugged for few hours.
After this initial delay, in order to completely discharge panels, or to check this is the case, you can use first a HT probe then once below 1kV your favorite multimeter.
Do not under-estimate potential threat of audio signal going through step-up transformer: disconnect everything going to speakers before deciding to open it. Then wait for the given delay (few hours is a bare minimum).
Remember: electricity can kill and will if you’re not skilled enough. In doubt, do not touch anything. This is your responsibility to open your speaker.
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