Dan A4-SFX terrible noise level under load

While ~10L seems to be more popular these days I wanted to go for a more compact build. Found a used Dan A4 with already two Noctua fans installed.

I really like the size and looks of the case, however the noise coming from the fans under load is unbearable.

I’m using a Panorama 2 with an A9x14 and additional two A9x14 as exhaust. I spend some time undervolting the 9700X and modifying the fan curve. I can now run all fans at 20% (silent) with idle temperatures averaging 50C. However, anything more then 30% on the CPU fan or 50% on the Case fans results in terrible noises. I tested the fans outside of the case and they are absolutely fine that way. For the CPU fan removing the side panels solves the issue aswell.

Why does the case produce so much noise with these fans and is this somehow fixable? If not what case could be an alternative? I like the versatility of the T1.

While ~10L seems to be more popular these days I wanted to go for a more compact build. Found a used Dan A4 with already two Noctua fans installed.

I really like the size and looks of the case, however the noise coming from the fans under load is unbearable.

I’m using a Panorama 2 with an A9x14 and additional two A9x14 as exhaust. I spend some time undervolting the 9700X and modifying the fan curve. I can now run all fans at 20% (silent) with idle temperatures averaging 50C. However, anything more then 30% on the CPU fan or 50% on the Case fans results in terrible noises. I tested the fans outside of the case and they are absolutely fine that way. For the CPU fan removing the side panels solves the issue aswell.

Why does the case produce so much noise with these fans and is this somehow fixable? If not what case could be an alternative? I like the versatility of the T1.