Very high quality fans, but still this series is taken first of all for its noiselessness, and this fan is audible at 1200-1300 rpm and higher. Of course, if you keep it at 1000 rpm, then this is an excellent model, but in my conditions 1400-1600 rpm is necessary, and this is already loud. There are no overtones, just air noise, but loud. Noctua has a series A - air noise is also heard there, but it is quieter at the same time, although the price tag is twice as expensive. Or maybe its all self-hypnosis and quiet fans at 1600 rpm do not exist at all)) xs. In general, the fan is excellent, it cannot be compared with cheap ones.전체 리뷰보기