I'd be lnterested in knowing how quiet the Bell helmet is. I bought a Nolan N104 after years of happy ownership of the N102. Sorry to say, it's MUCH louder than the N102, and the faceshield positions are annoying (slams shut at 35mph).
The revolver is definitely louder than my old Aria. In my case ear protection is necessary. I think any modular helmet will be louder than a full face. The modular helmet lets the noise in all along the joint between the 2 pieces( helmet and flip visor).