If you've looked at the KEF Q7 thread, you'll know I'm about to get a pair of these speakers for my mains. All my speakers are set to small. I've had my set up for sometime, but have never really gotten to grips with the sub. I just set it so it doesn't sound over-baring. How should I go about setting the three knobs on the back from scratch? They are main volume, LFE volume, and the roll off. Where do I start in getting an optimum setting? Any help will be much appreciated.