Unfortunately the quality of (some) used components / quality of control seems to be severely lacking here. Obviously all we know is based on information posted on this or other forums or other places. Topping is the only party that has a clear picture how many units were returned or how many/what kind of problems are reported. But I must say that I'm disappointed:
- my first unit had this problem with the volume knob when trying to increase volume would be ignored,
- for the second unit this problem was less pronounced, although still present, but around 1 month ago one of the segments on the LCD display starts disappearing,
- now I'm waiting for the third unit...
It is nice that the merchant said that I can keep faulty units - may be useful for some future repairs, outside the warranty window...
I don't want to be mean or ironic, but... less SINAD, more quality control...
@JohnYang1997.