However they have one huge flaw: they have a so-called "power saving". It's a big stew. She decided to turn off the sound when "there is no sound", to save power. The problem is that "There is no sound" has a different meaning for someone who has lost 90% of its hearing sensitivity by dint of listening to heavy metal at full speed and someone who wants to listen to a pianissimo in classical music, or silence in a film.
In practice, the input volume is not loud enough, COUIC the sound is muted. Once the volume rises, pregnant take several seconds to restart. Result: in a movie after a long silence, one who takes the floor is transformed into mime. It's clever.
In short, this is a "feature" that makes them unusable strictly pregnant and can not be disabled. To avoid absolutely. I do not understand that Harman manufactures such things.