Normalized Noise Tests
For these tests, I set the fan to speeds with noise output at the following predefined levels: 20/25/30/35/40/45 dBA. I skip the corresponding tests if the fan under the test cannot reach some noise levels. The speeds shown in the graph below are measured with the fan in a clear space inside my hemi-anechoic chamber without any obstacles. I set these speeds on the Longwin machine, but they slightly change because of the variable conditions that the device applies.
Lately, we discovered a peculiarity of the Longwin apparatus, so we are re-testing every fan we have, and we will continue to double-check all results because it seems the Longwin’s fan controller doesn’t “like” speed control for these tests, but it works better with PWM control. This is why you will find differences with results listed in previous reviews; we constantly update the noise-normalized tests to make them as accurate as possible!
20 dBA Noise Output
Both fans have a highly effective noise design, and as expected the FDB model gets the lead in speed, achieving higher performance.
25 dBA Noise Output
The difference in speed gets smaller, while the Black (DBB) model wins clearly in airflow, while the difference in static pressure is minimal.
30 dBA Noise Output
The speed difference is large here, in favor of the White (FDB) model, allowing it to achieve slightly higher airflow and static pressure.
35 dBA Noise Output
Again a notable difference in speed, while the performance difference is much smaller (compared to the speed difference), with the FDB model having the lead.
40 dBA Noise Output
Not so high-speed difference, with the DBB model winning in performance, not by a large margin.