It's true and known that the Devialets struggle with very low (sub 2 ohm) impedance drops. At least I've known this from early on from the early D-Premier reviews. Things have improved over time thanks to Devialet tuning it's PSU firmware and the introduction of the 110/170/240 range (now 120/200/250) but I guess even they can't circumvent the laws of physics in such a small box with a 600W SMPS PSU. 
The Sanders must be an exception though and a real torture test apparently, other ESL's do behave properly. I've been following Devialet for years and have never read a report like yours before.
I think the problem lies with the Sanders not Devialet, they'll probably need the old-skool 2kW into 2Ohm, 100kg mono blocks as big as refrigerators, generating enough heat to heat a small home.
The Sanders must be an exception though and a real torture test apparently, other ESL's do behave properly. I've been following Devialet for years and have never read a report like yours before.
I think the problem lies with the Sanders not Devialet, they'll probably need the old-skool 2kW into 2Ohm, 100kg mono blocks as big as refrigerators, generating enough heat to heat a small home.
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