You could try upping the target temp (mine is at 94 C) to see if the fans have to work less, but I bet this is primarily a difference in fan size 140 vs 120 and noctua vs stock for the db level.

I probably should keep it off the carpet honestly, but I have found if you stack the miner with the PSU on the bottom and add some rubber padding the ground will barely get warm from contact during normal operation.