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Directly behind the power and reset buttons on the inside we can find an 80mm fan (that royal Dutch colored fan) which will blow air over your HD's.

At the backside mounted to a mesh we see a  set of dual 60mm exhaust fans. Thermaltake rates these at 2500rpm at a 19dBA noise level, so I am in a moment we'll measure these sound levels to see if they are that quiet and if they move any air. The cooling plan is sufficient though. All temperatures remained at very normal levels.

Quite lovely is the fact that the Mozart can support a full size ATX power supplies which gives you loads of options. It is nice to see the extra height of this case being put to good use by allowing that standard ATX power supplies. We mount a fanless design PSU in there.

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.

Right then, we enabled the fanless PSU after connecting and enabling all fans in the Mozart. Very impressive results. We stay well below 40 DBa

Inside the PC there is a decent portion of airflow coming from the fans, but hey this is a rather quiet sound level.