As usual we grabbed our dBA meter. The human hearing system has different sensitivities at different frequencies. This means that the perception of noise is not at all equal at every frequency. Noise with significant measured levels (in dB) at high or low frequencies will not be as annoying as it would be when its energy is concentrated in the middle frequencies. In other words, the measured noise levels in dB will not reflect the actual human perception of the loudness of the noise. That's why we measure the dBA level. A specific circuit is added to the sound level meter to correct its reading in regard to this concept. This reading is the noise level in dBA. The letter A is added to indicate the correction that was made in the measurement.
As always we measure 75 CM away from the product (usually the distance between you and a desktop computer).
Here's where the Silent Pro M2 impresses, we measure 33 dbA from the isolated test setup under a load of just over 500 and 750W. So if you fool around with fan RPM yourself, you can tweak it to perfection regardless, it is a very silent PSU at default and does its name justice.
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