After reading various reviews regarding various systems, I bought the TH-S55 based on quality, input availability etc. Upon setting up and playing from various sources, I note a wide variance in the required volume levels. When playing a DVD movie, the volume has be set to 20+ to be comfortably audible. Similarly, when sound is input from Aux (Sky) or AuxD (Xbox), the volume level has to be selected at a similar level. However, if FM radio is selected, a volume level of only 5 is required with anything more than 10 being very loud for the room. Can anyone tell me if this is variance is normal? Can anyone advise optimal settings? A review within HomeCinemaChoice suggests NOT to have the volume above 11! Thanks.