As silent as they are, each fan is adding 20dB of Noise. There goes the great ASR specs. :D When Amir does his next measurements, somebody needs to remind him to add 3 x 120mm fans atop the AVR first before making any measurements. :D Nah, at full speed Noctua claim 17.7 dB(A) noise for my AVR fans but I run those at a very much lower RPM: https://noctua.at/en/products/fan/nf-a8-pwm/specification