I don't know what the Thermaltake engineers were thinking when they made that hole in the bottom of the case, since it won't have any effect when the case is in its normal upright position. Actually, it looks even worse, since there is so little room between the PSU and the bottom of the case that there is no path for the air to flow, especially if the case is on a carpeted floor.
Try removing the dust filter from the hole and block it with something like a sheet of paper taped over it. It may help reduce noise, but I doubt it, since TT has done its usual job of paying little attention to well-managed airflow and even less to acoustics. Raising the power supply just a half-inch higher above the bottom would have improved the airflow and noise significantly. As it is, the restrictive airflow creates so much static pressure that it can't help but create too much noise.
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