Regarding NAS loudness volume: I can give you some advice as mine is in my bedroom.
Choose quiet drives. I deployed 4x Toshiba N300 15TB He HDDsin RaidZ2
Maybe mod the drive cages: Use something like sticly velcro strips (soft side) on all sides that HDD/caddies touch the case/chassie.
Move your intensive access times to late night (4am for example) or when you are at work/gone from home.

Happy storing :)