joestone:Im thinking about the 685/c355 combo or 686/c326 depending on my budget when i go buy. Im not gonna add a sub for now as i found the bass good enough when i heard the 686's a few weeks ago. Like you I really loved how the 686's sounded and was blown away by how big those little boxes sounded too
My room is about 3,5 by 4 meters and that is smaller than the room i heard the 686's in. Didnt get to hear the 685's but im guessing they sound even bigger. When I read around on the web i see that alot of people are preferring the 686 over the 685 for some reason even if that feeling is not shared by the WhatHifi staff.
I think the 686's will be more than enough for that room, may as well save yourself the £100
I even think you would get away with the 686's biggus, but if u want to be sure and don't mind dishing out the extra, go for the 685's because they will fill that room better. Especially if you aren't going to get a sub.