I think OP is looking for a PC, perhaps already has a laptop.
I use HP slim desktop PC (actually horizontal on a shelf below the desktop) in my office because Laptops do not have 27" monitors or DVD drives these days. I use 32gb memory for multiple programs open, editing lots of Photos, CAD work, not enough usb 3.0 ports .... i.e. lots of reasons to have a PC. IF so, then go for a quiet one, every part of it quiet as I described previously here.
my laptop, I moved down to 14" screen for easier size/weight (real keyboard). It has Bang and Olufsen speakers (Audio by B&O; Dual speakers; HP Audio Boost).
It has enough volume for several people to hear, and it’s hdmi out passes enough volume when streaming using a TV in a vacation rental or when visiting family.
prior Laptop, max volume sucked.