Améliorée, optimisée or enrichie. It's hard to say when you're talking about specs.

You could give all the terms to your client see what he says.

Like so many of these types of things, this should properly be regarded rather like a proper name, a term coined by a manufacturer to describe their own particular feature.

That said, like Rousselures, I feel that the term "cinema" is the key point here to underline, especially since " 'ome cinéma" is so much in vogue at the moment.

"sono ciné" might be a snappy way of coining something equivalently meaningless in FR