888 Digital 565 manual Movie DSP preset parameters, Using dynamic range control

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 44.

†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.

DSP presets

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