My husband and the noise machine

I am so grateful for my husbands help with our 12w old LO. I EBF but he helps a lot with putting her down for naps and bedtime. He’s a combat veteran so some crying doesn’t get to him as much, and already had 3 kids from previous marriage.

HOWEVER once he discovered how the hatch can be amazing for bedtime and naps he has started holding it close to her while standing and rocking her. I always make sure that at bedtime it’s well below the 50 Dec recommendation but he doesn’t seem to pay attention as much and can keep it pretty loud and close and gets irritated when I tell him something about it. I am SO maxed out I CANNOT do this alone but I am worried that her hearing will be affected. I’m just so annoyed and idk what to do. His approach tends to be if you don’t like how I’m doing it so do ut yourself.