Ideas for Sound Reduction in Miners

Hey there I'm working with a couple of Antminer S11s and I've put together my own sound reduction box using two different materials. Just looking for some fresh ideas on how to improve it. Anyone here got experience they can share?

I did a series of videos on youtube. I will look for links

You can get various 3D printed exhaust “baffles” on ebay some incorporate the PSU aswell.

step by step build https://www.youtube.com/watch?v=6soWakwmK5M https://www.youtube.com/watch?v=THQHtFPkzuk https://www.youtube.com/watch?v=8X15H0qLNyI https://www.youtube.com/watch?v=thH3vMx28RM https://www.youtube.com/watch?v=DySrCBras3w you can use lighter  materials that wood these will work https://www.lowes.com/pd/Kingspan-Insulation-Common-2-in-x-4-ft-x-8-ft-Actual-2-in-x-4-ft-x-8-ft-1-R-10-Unfaced-Polystyrene-Foam-Board-Insulation/999972968 still use other materials for fire safety

Everyone has their own requirements regarding how loud something can be.  this would work for me:  https://www.youtube.com/watch?v=uk69-dsYsoo I don't need 100% noise reduction.  that video with the dual exhaust thing would be enough to keep the noise in the basement where it doesn't bother anyone in the rest of the place another one  https://www.youtube.com/watch?v=WpRAbe8g_sw