Top sound. 9.1 Excellent simulation of listening comfort even several hours. A technical installation a bit complex (notice a little mess) but you get there. Namely: in TV mode, you can keep the TV sound if you listen to many. But not with a Blu-ray player, DVD recorder, etc. By lopping s on HDMI. No parasite's to date. The headset automatically switches effectively on 2 frequencies of existing waves. Practice. In short, great purchase. Ultra fast delivery and very well packaged.