I have this amplifier and it does make noise when cooling. I never turn it off except for system changes. It sounds better when always left on. Putting in a Synergistic Research Blue fuse makes a nice improvement and is a one minute job.
Ever heard a house heating duct clang and bang mid winter when it’s belting out hot air and cooling. No different. Refractory lined cool systems are coming. Then again Class D is an efficient bulldozer. I can only afford late 90’s tech but it’s a pretty sweet ride.