I have a Sony bravia tv and hta3000 sound bar. I’ve got it all connected properly and I’m utilising the TV as the centre speaker and it really works well and you can tell a difference. 

My issue is that the speakers on the tv are making an odd noise, like a faint hissing or crickets type noise. Is this right? I have a small room and my sofa is only 2 metres from the TV so it can be quite obvious but I wonder if this is also the issue as I wouldn’t notice it if I was further away. Is this how the speakers work to give the impression of the sound coming from the screen?