i've got a 8" MAX on a Can 100 and its awesome. Noise is barely noticable outside of the room. I imagine with a muffler on the other end of the max it'll be damn near silent.
Phillthy-
I am running that exact setup, Can Max 10 and the 150. It's the loudest part of my system, but my only other blower fan is a Can Max 14, the ultra quiet model, so use that as a reference. It's definitely better than conventional centrifugal blowers.
I should clarify-
This is being run in a sealed room, so it's recirculating. Fan is not ducted to anything, it simply pulls air through the filter and blows it back into the environment. This definitely makes the fan louder than if it were ducted into something