Thought to check the TA-25 mains adapter, because often some switching power supplies thoroughly pollute the network, causing noticeable damage to the sound of the system.This image shows noise level measured on Taga Harmony PF1000 filtered part:
Then I`ve connected switching power adapto of "TA-25 mini" . As seen from the indicator readings, the noise rate is even lower, as without the connected adapter. This means that the "TA-25 mini" 230V adapter are not carrying extra noise and its built-in parallel circuit of input filter slightly reduce the overall level of interference.
Of course, this amplifier is not designed for High-end systems and the amp could operate with lower quality adapter, but just such "small stuff" describes the manufacturer's attitude towards its product quality and attitude towards customers. All respect Taga Harmony!