Please help!! Have just purchased KEF system (Q55.2 fronts, Q15.2 rears and Q95C centre) to go with my KEF Model 20B subwoofer. Can anyone help me with how to set up the subwoofer (phase, crossover and level) to get the best out of it within this system? The instructions with all the speakers have been useless!! I also have the Sony STR-DB930 receiver so any settings for this (LFE level, crossover, etc) would be helpful. Thanks!!