So just got off a Concept. I'd day it's as loud as the tall tower fans on high. Louder than I thought, but not machine shop fan loud. If you're in a separate room you should be fine. If there are folks in the room with you watching TV or talking they might need to increase their volume a bit, but not much.

Hope this helps.

FYI...not sure if one is a newer model or not but the two in my gym are both Concept 2's. Length is the same, but one is about 6 inches taller, and has a little different frame set up for the wheel. Width and length seems unchanged between the two.