Are there different Home THX technologies?
No. But there are different implementations of basic THX circuits optimized for analog matrix and digital discrete surround sound signals. For instance, THX for Dolby Pro Logic (Denon calls this “THX 4.0”) is not quite the same as “THX 5.1” for Dolby Digital (AC-3) sources. Thats because Dolby Pro Logic and Dolby Digital are very different and require different enhancements to bring you optimal performance. For example, Dolby Pro Logic is an analog matrix technique that delivers only a monophonic surround signal: Even though you hear “them” from different speakers, all rear channel information is identical. To increase the apparent spaciousness of this mono signal, THX Decorrelation® circuits shift relative inter-channel phase to decrease any sense of directionality. Thats important in keeping our focus on the screen in front of us. Rear channel information is primarily ambient (or diffused) in nature. It supports the story being presented and shouldnt distract us with strong aural clu
