Bang & Olufsen BeoVision Avant - Technical Sound Guide - Manual (Page 19)

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Setup: Sound: Speaker Groups: PRESETNAME: Advanced Settings: LFE input to Ceiling
Five-channel recordings for music
without accompanying video are almost
always produced in 5.0. In other words,
there is no need for an LFE channel,
since most music does not contain low
frequency effects such as explosions or
dinosaur footsteps (in fact, some record
labels do not include any signal on the
LFE channel on their multichannel
releases).
Some formats, such as SACD, DVD-Audio
and Blu-ray discs, do not limit the
content of the LFE channel to low-
frequency information only.
As a result of these two facts, some
record labels use the LFE channel on
their discs for height information
instead of low frequency effects. This
means that the LFE input channel should
be directed to a ‘full range’ loudspeaker
placed above the listener.* This can be
accomplished in the television by setting
the LFE Input to Ceiling parameter to
ON. This will direct the audio signal on
the LFE input to a loudspeaker with a
‘Ceiling’ Speaker Role.
Range: ON / OFF.
* Consult the liner notes for your disc(s) for
correct loudspeaker placement of the ceiling
speaker.
Setup: Sound: Speaker Groups: PRESETNAME: Advanced Settings: Subwoofer
Selecting this menu moves you to the
advanced settings for the subwoofer
output. Note that, if you have more than one
subwoofer, the parameters in this menu
are applied to all subwoofer outputs.
Setup: Sound: Speaker Groups: PRESETNAME: Advanced Settings: Bass Management: Crossover
Frequency
The crossover used in the Bass
Management system is a 4 th -order
Linkwitz-Riley type. All output signals
use the same crossover frequency to
ensure that coherent signals on multiple
output channels have matched phase
responses when passed through the Bass
Management and Bass Re-direction
processing.
Range: Bypass, 20 Hz to 300 Hz.
Step size: 1 Hz.
10 100 1,000 10,000
−80
−70
−60
−50
−40
−30
−20
−10
0
Frequency (Hz)
Magnitude (dB)
Bass Management − Magnitude Responses
Figure 10: Magnitude response of the
crossover used in the Bass Management
system, showing an example with default
frequency of 120 Hz.