PSU position adds 50% noise level

Hi all

I was bothered with how loud my comp was (specs in sig) so I decided to find the culprit and after uplugging the fans and still noticing loud noise levels I decided to reposition the PSU outside the comp and bam huge reduction in noise

Turns out that when the psu is screwed into its spot down the bottom of the case with the case upright and the PSU fan blowing out the bottom of the case the noise some how increases by around 50% I have turned the case on its side and that fixed the problem but I can't leave it like that

So does anyone else have similar problems and a simple fix or suggestions to help any info appreciated

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.