I also bought two 260-2 stereo boards—one in 2025 and the second in 2026. The first board produces a popping sound in the speakers when the power is cut (Amir’s review confirmed this power-off pop). The second board has no such popping sound; it is perfect for me. I had to seek advice on this forum and correspond with 3E to figure out how to eliminate that annoying pop. I sent 3E video and audio recordings confirming the issue. I read many customer reviews; some 3E buyers experienced the popping sound, while others didn't. Why does this happen? Perhaps quality control for the finished boards needs to be tightened? To fix the popping sound, I had to order a relay from China. It meant a long wait and extra cost. In normal times, that wouldn't be a burden, but right now in Ukraine, it has become difficult and expensive—prices have soared while our incomes have dropped. You wrote a post for my information, and I am replying to it. (By the way, 3E acknowledged the defect and provided financial compensation. I am grateful to the company; thank you to them for the help and the compensation. That is why I bought another board from 3E in 2026. It is perfect—no popping or noise.) I assume that 3E has done some additional work to eliminate the popping sound. If that is the case, it is good news for all buyers.