I'm solving with the seller a manufacturing defect of the amplifier - (probably) incorrect grounding causes a hum of 50Hz at the output to the speakers. As soon as we eliminate the defect, I will leave an additional Feedback. Otherwise, the amplifier is processed very well - the chassis is solid (does not resonate), the printed circuit boards and components are well soldered with tin. The seller behaves professionally and I trust him. TThe amplifier came very quickly and well packaged. I can recommend the seller.
The seller promised to look for the cause of the hum 50Hz, but since then he has not answered my questions. I don't think he wants to help. Amplifier quality is not Hi-Fi and the seller does not provide technical support. : - ((
very well packed, quick delivery. simple clean design,beautiful sound, work perfectly with my Qulcos digital player and DAC, good performance to price. like it very much. Recommend.