Crackling sounds are usually a dirty potentiometer. Some tuner spray fixes that. It is rare for caps to go bad in just a few years and I'm not sure what a "power unit" is. Very curious.
Yes from what i read the M6si has this issue with crackiing sound coming from the speakers, which is power supply related. Does the M5si have the same issue?
My unit is almost a year old now, and I have no problem with it. Hopefully, the newer ones don't develop this problem. With the large quantity of these units sold, there are only a couple of people who have posted a problem on this forum. I wonder if they have a good power source and surge protection?
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