Does your TV have a built-in Hi-Def Tuner?, if so, do you still get the noise if you use the TV's internal Hi-Def tuner, rather than passing sound to the sound bar from the Humax.
If your Humax is a terrestrial model, this post is in the wrong forum thread, can you give us the model number of the Humax, TV and sound bar?
1) Sony TV model number
2) Humax Sound bar model number
3) Humax Terrestrial DVR model number
4) Humax DVR >> Humax soundbar = O.K.? (gomezz #2 above)
5) Sony TV >> Humax soundbar (no Humax DVR connected) = O.K.?
6) Humax DVR >> Sony TV internal speakers = O.K.? (as in #3 above?)
7) What is Humax soundbar connection type (gomezz #1 above)