JBL CS3 - Manual (Page 27)

Surround Modes
Dolby Digital: Available only with digital input sources encoded
with Dolby Digital data. It provides up to five separate main audio
channels and a special dedicated low-frequency effects channel.
DTS: Available only with digital input sources encoded with DTS
data. Available on special DVD, LD and audio-only discs, DTS
provides up to five separate main audio channels and a special
dedicated low-frequency channel.
Dolby Pro Logic II: Dolby Pro Logic II is the latest version of Dolby
Laboratory’s benchmark surround technology that creates or
decodes full-range, discrete left, center, right, right surround and
left surround channels from Matrix surround-encoded programs
and conventional Stereo sources. The Dolby Pro Logic II Movie
mode is optimized for movie soundtracks that are recorded with
matrix surround, by creating true rear left, center and right signals.
The Pro Logic II Music mode should be used with musical
selections, that are recorded with Matrix surround or with normal
Stereo mode, creating discrete rear left and right signals.
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TV MENU, AUX MENU, DIGITAL IN MENU