I have a Sony BDV-E4100 hometheater with HDMI ARC audio. However I have a small collection of 4K Ultra HD Blu Rays. So, everytime I watch a movie in the 4K player (Panasonic UB320) , it decodes de audio internaly to Stereo PCM (HDMI audio out). Then my hometheater receives the audio and uses DTS NEO 6 or Dolby Pro Logic to recreate surround. My question, is there a loss of quality in this process? I notice some movie's volume were a little bit low, but in other movies was the same. I did some research, but I don't understand what audio bandwith is.