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Dolby volume
Dolby Volume is a sophisticated new
technology that resolves the problem of
dierent volume levels between programme content
(e.g. a TV show and advert breaks) and between sources
(e.g. a rock radio station and DVD, or between two
TV stations). It lets the listener enjoy everything at the
same preferred listening level without having to reach
for the volume control to compensate for the dierent
recording/output levels. is is the Volume Leveller
function of Dolby Volume.
Dolby Volume also works in conjunction with the
AVR400 volume control setting to compensate for
the ear’s changing sensitivity at dierent frequencies
depending on how loud the audio is. It is based on
a model of how human hearing works. It properly
balances low, mid and high frequencies to maintain all
the nuances and impact of the original audio regardless
of the actual selected playback volume level. is is the
Volume Modeller function of Dolby Volume.
Dolby Volume measures, analyses and maintains volume
levels based on how people perceive sound. A variety of
audio parameters are monitored including spectral- and
time-based loudness to ensure that perceived dynamics,
timbre and bass performance remain consistent at all
volume levels.
Dolby Volume also lets the listener control a
programme’s dynamic range – the range between loud
and quiet sounds. For example, with the volume turned
down for late-night viewing, dynamic range can be
adjusted so that speech remains clear and loud eects or
music passages retain their impact without waking up
the family.
Settings
Dolby Volume can be applied to any analogue or digital
stereo source or any digital multi-channel source. It is
not available in Stereo Direct or on the analogue multi-
channel input. Dolby Volume can even be applied to
processing of stereo signals (e.g. PLII Music) or when
down-mixing a digital multi-channel source (e.g. Dolby
Digital 5.1 down to stereo).
Dolby Volume can be enabled and congured separately
for each audio input in the Input Cong menu. e
default is ‘O’ for ‘audiophile’ listening. You may wish
to turn Dolby Volume ‘On’ for TV and movie sources
to maintain the same perceived overall listening level
between sources and frequency response regardless of
the volume setting. Most of the controlling parameters
of Dolby Volume are automatic as they are dependent
on analysis of the audio signal and the volume setting
of the AVR400. However, the Volume Leveller and
Calibration Oset controls (see below) can be adjusted
to your preference.
Volume Leveller
e Volume Leveller function of Dolby Volume controls
how closely quiet and loud sources and programme
content are matched to each other, based on the
ear’s perception of loudness. e range of values is 0
(minimal levelling) to 10 (maximum levelling). e
default setting is 2. If the Volume Leveller function
is turned o, no level matching between sources and
programme material is performed. is is not the
same as turning Dolby Volume o as volume related
frequency response processing is still active.
When Dolby Volume is being applied to the current
input, a Dolby Volume processing mode indicator is
shown on the OSD and the front panel display.
Calibration Oset
e Calibration Oset parameter of Dolby Volume
allows you to compensate for speaker eciencies and
listening position – eectively moving the reference
listening level up or down the volume scale. e default
value is 0 and this should normally produce a good
result when the AVR400 speaker levels are set using
a sound pressure level meter at the listening position
(75dB SPL, ‘C’ weighting, slow response).
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