Meridian Audio 568 - Manual (Page 53)

DSP presets
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The discrete digital formats can encode up to eight separate
channels, which can be decoded to provide separate signals to
the eight speakers in a surround configuration.
Dolby Digital
Dolby Digital is a totally digital format capable of encoding five
full frequency-range channels, together with one restricted
frequency-range channel used for extreme bass.
The digital surround processor’s Dolby Digital preset is capable
of decoding the range of different options provided by Dolby
Digital. In addition, it provides bass power management to
protect systems from the potentially high bass levels that Dolby
Digital can produce.
DTS
DTS is unusual among the compressed surround formats in that
it can deliver high quality music at high bit rates.
CDs and LaserDiscs are currently available which provide a DTS
signal in place of the normal digital audio. DVDs may also
feature DTS soundtracks.
MPEG
MPEG surround is the preferred audio format for DVD in PAL
territories.
Dolby Digital THX, DTS THX, and
MPEG THX
As with the standard THX Cinema DSP preset, Dolby Digital
THX, DTS THX, and MPEG THX re-equalise the signals to suit
domestic listening conditions, and applies frequency-response
correction and decorrelation to the surround channels to make
the surround sound more realistic, and can be used whether or
not your other equipment is THX approved.
5.1 Movie DSP presets