@Soniclife, no, it's similar music / volume. I live in the US, and the mains' voltage is consistent, so the voltage regulator, apparently, does not do much for me. I think those who suggested that it may be ripple (high frequency) signals sent by my electric company are onto something. I'll wait for the next FW, but if it does not help, will try something like this, for filtering frequencies above 50HZ:
https://www.amazon.com/dp/B07594SC84/?co..._lig_dp_it
> When was the last time you got a good update from Devialet on this issue?
Good update? I've never gotten one! They don't seem to know the root cause (or did not, at the time I exchanged emails with them), but they're looking into it, as is evidenced by their having sent me a FW patch to try. They even offered a loaner unit, to test if this may be an issue with mine. But the fact that it happens to other people, and that it happens to me only at certain times of the day (but not everyday - more like once a week), tells me there is nothing wrong with the amp itself.
https://www.amazon.com/dp/B07594SC84/?co..._lig_dp_it
> When was the last time you got a good update from Devialet on this issue?
Good update? I've never gotten one! They don't seem to know the root cause (or did not, at the time I exchanged emails with them), but they're looking into it, as is evidenced by their having sent me a FW patch to try. They even offered a loaner unit, to test if this may be an issue with mine. But the fact that it happens to other people, and that it happens to me only at certain times of the day (but not everyday - more like once a week), tells me there is nothing wrong with the amp itself.
JRiver MC20 --> Devialet 250 Expert Pro --> KEF Blades II
