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DSP presets
47
5.1 Movie DSP preset parameters
Parameter Options What it changes
Surr. Rear Surr. Rear, Surr. Side, Switches the surround
Surr. All signal between the side
and rear speakers.
LFE 0 to -30dB The relative level of the
LFE bass channel.
Max SPL * 105 to 120dB SPL The peak-level limit for an
LFE subwoofer.
Limit * -15 to -5dBFS The peak-level limit of the
total bass signal added
to the main speakers.
Compress † Off, Low, Med, The dynamic range
Top, Max, Mix control; see opposite.
* See Using peak-level limiting, page 48.
† Dolby Digital and Dolby Digital THX only.
Using dynamic range control
Because Dolby Digital is a digital format it allows dynamic range
control without the distortion involved in analogue methods. The
Compress parameter can be set to one of the following options:
Option Description
Off No compression.
Low Provides moderate bottom-up compression. This
raises quiet sounds above the background noise,
which is ideal for demonstration and quiet listening.
Med Provides moderate amounts of both bottom-up and
top-down compression.
Top Provides a moderate amount of top-down
compression. This reduces loud sounds.
Max Provides full bottom-up and top-down compression.
Quiet sounds are raised to be audible and loud
passages are minimised to avoid disturbance, which
is useful for late-night listening.
Mix Bypasses dialogue normalisation and references the
sound pressure level in the studio where the material
was mixed.