Brians-
I currenty wear metal housed industiral ear muffs, and I'm sure an active noise cancelling set would be even more effective. On the down side, it's not so helpful when customers come in to plan their wedding album, choose wall enlargements, etc. After 18m of being a secret ear muffs/head phones wearer, rather than ordering something more styish & coming out of the closet, I'd rather just get rid of the things altogether!
Long Haired Git-
I use 1+TB worth of h/drives, so unless I setup these in a gig-lan server from my shed, I probably need some sort of aggresive heat removal from inside any sound reduction box.
Where can I find out more about this mysterious "Cathar-dual-loop config" ?