A friend has got a Yamaha HTR-5540RDS and Eltax Liberty 5.1 speaker set. The room is 4m by 3.5. My friend lives in a flat and there is someone in the groundfloor flat. I'm ok with positioning the speakers, interconnects. What I need to know is what advice you can give for: Setting for speakers small or large (?) Setting of any delays? Sub crossover? Phase control on sub and recommendations on setting sub volume levels. How does the whole phase thing work? Any other points Thanks.