Pioneer SC-LX83 Reference Manual page 12

Optimum Surround
LX83
Dialogue, bass, and surround sound are the three elements of
cinema sound. When soundtracks are played on a home theatre
at a much lower volume, the impression may become quite
different. Optimum Surround is a Pioneer-exclusive listening
mode for solving this problem, developed through repeated
interviews with actual film makers. For each scene, this
technology automatically optimises the balance of the three
elements with an original algorithm. Bring home the real thrills
of the cinema as intended by the creators.
Front Stage Surround Advance
LX83 LX73 LX53
With Front Stage Surround Advance, you can enjoy surround
sound coming from only the front speakers and the subwoofer.
Since wall reflections are not used, the setup is less dependent
on the room environment, allowing front alignment of the
speakers. Front Stage Surround Advance creates an excellent
sound image and natural sound.
Three Elements of Cinema Sound Controlled by Optimum Surround
Bass Boost
Surround Sound
Enhancement
Front Stage Surround Advance Sound Image
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A/V RECEIVERS REFERENCE GUIDE
Dialogue Enhancement