I'm trying to summarize this topic for my own understanding.
First issue:
When both channels are being active we get normal looking measurements.
However, if we review each channel individually, we can see that M500's left channel has a fault with 3rd harmonic (credits to deleted user liu).
This is a firmware issue potentially affecting various SMSL products, we can fix this via firmware update or turning the volume down (on the M500 set it to <=30).
Prof.
@WolfX-700 is meeting SMSL's boss in late May to discuss solutions for the customer base.
Second issue:
M500's product pages falsely stated OPA1612 instead of LME49720 as op amps (credits to deleted user liu).
Example: description on
Amazon still has OPA1612.
My personal take on this:
This discovery is a big deal isn't it?
If we look at both channels at the same time, the mistakes on one channel might get masked by the other channel, giving us false measurement.
May my prayers reach Prof.
@WolfX-700 and SMSL's team. I hope they can find easy solution.