Meridian 568 User Manual page 54

5.1 Movie DSP preset parameters
Parameter Options
Surr. Rear Surr. Rear, Surr. Side, Switches the surround
Surr. All
LFE 0 to -30dB
Max SPL * 105 to 120dB SPL
Limit * -15 to -5dBFS
Compress † Off, Low, Med,
Top, Max, Mix
* See Using peak-level limiting, page 48.
† Dolby Digital and Dolby Digital THX only.
What it changes
signal between the side
and rear speakers.
The relative level of the
LFE bass channel.
The peak-level limit for an
LFE subwoofer.
The peak-level limit of the
total bass signal added
to the main speakers.
The dynamic range
control; see opposite.
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.
47