Hi All, I've recently got one of these units from a friend but noticed that the centre channel (the main unit) does not output any sound when in surround sound mode i.e. when the wireless speakers are detached and when the speakers are attached, there is a soft high pitch buzz coming from the centre and the Left and Right channels are very soft, barely any mid range and not very audible. I assume because they are just adding to the sound that should be produced by the centre. Contacting Phillips support has been a complete waste, and wonder if anyone has had that experience and fixed it? I've tried connecting through HDMI (ARC), RCA, Optical, Line In... all with the same result so I'm pretty sure its the unit that has/is failing and not the connection. Anyone had any luck in repairing these? Also it seems the battery in the Left speaker can hardly hold its own, after 1hr30mins, the battery indicator turns red, can they even be changed?