Focal ASTRAL 16 Manuel D'utilisation page 12

ASTRAL 16
™
U s e r m a n u a l
* Items 14 and 15 pertain to Standard Bass
Management Mode in which the crossover point
and slope defined apply to both the high pass and
low pass sides of the filter equally. For Expert Bass
Management, see "Expert Bass Management".
14. Frequency
When the channel is set to Small or Large and
Sub, the Frequency defines the point below which
bass in this channel is routed to the subwoofer(s).
Note that the frequency is the -3dB point along
the slope defined in the next column and is not an
absolute cutoff point.
15. Slope
The rate at which bass is 'crossed over' into the
subwoofer when the channel is set to Small or
Large and Sub. LR 12dB and LR 24dB are 2
order and 4 th order Linkwitz Riley alignments
respectively.
16. With LFE
When a channel is set to Large or Large and Sub,
this channel can optionally reproduce LFE bass
which would normally be the sole responsibility
of the subwoofer channels. When set to None,
no LFE will be mixed into this channel. When set
to a figure between 0dB and -20dB, LFE bass
attenuated by that figure will be mixed into this
channel. This feature is useful when the main
channels have sufficient bandwidth AND dynamic
range to support the subwoofers in creating an
appropriate amount of bass sound pressure in the
room.
Items 19-22 apply to settings found in the 'Delay,
Level, Limiter, and Phase' section.
17. TiltEQ
For speakers behind a motorized screen for
example, you might need to change their "audio
brightness" depending on the screen position up
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or down. TiltEQ allows the sound to be darker of
brighter.
18. Delay units
Choose whether to measure channel delays in
meters (default), feet, or milliseconds.
19. Delay per Channel
Each channel should have distance/delay set
beteween that loudspeaker and the sweetspot.
You can define this in meters (default), feet, or ms
depending on your setting in 18.
20. Level
Set the level of each channel in between -100dB
and +12dB in 0.1dB increments. Best practice is
to set other channels to a negative figure relative
nd
to the loudest channel to avoid clipping when
possible. Global gain makeup can be applied to
the theater when the relative level of the theater
is too low (usually a result of a high degree of
correction due to Dirac Live's mixed phase filters).
Use global gain makeup judiciously to avoid
clipping.
21. Limiter
To prevent distortion due to
overdriving or amplifier clipping, you may wish
to engage a limiter on a channel. When enabled,
a compressor will attenuate audio above the
threshold set by the Limiter Value for that
channel back down to that value. For instance,
if the limiter is enabled and set to -3dBFS, any
audio that exceeds -3dBFS will be reproduced
at -3dBFS. By their nature, limiters are not ideal
acoustic solutions, but this feature can prevent
subjectively worse sounding distortion, or in
extreme cases, damage to loudspeakers or
amplifiers. If you find that you are aggressively
using the limiter function, you are encouraged to
upgrade loudspeakers and/or amplification.
ASTRAL 16
U s e r m a n u a l
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22. Phase Invert
Check the box for any channel in which you wish
to invert signal polarity.
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Expert Bass Management
20
When it is desirable to fine tune subwoofer
integration beyond what is possible in Standard
21 Bass Management
Expert. The flexibility within can achieve greater
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subwoofer integration, but should only be used
by calibrators with sufficient skill otherwise
comparably poor results may be inevitable.
Compared to Standard mode, Expert includes the
following features:
• Additional Size/Filter options
• Ability to separate HPF and LPF
frequency and slope per channel
• Ability to mix SUB bass (not just LFE
bass) back into channels set to Large,
Large and Sub and Large with Sub.
Size/Filter
Speakers may be set to one of the following
4 options:
• Small: Channel is high pass filtered according
to the HPF frequency and slope. Bass is routed
to subwoofer channels according to frequency
and slope defined by LPF frequency and
slope. Small speakers cannot have subwoofer
or LFE bass mixed in.
loudspeaker
• Large: Channel is not band limited. Channel
can have subwoofer and/or LFE bass mixed in.
• Large and Sub: Channel is not band limited,
but a copy of bass for this channel is routed
to subwoofer channels as well. Set the
frequency below which bass should be sent
to the subwoofer and the slope at which the
crossover occurs.
Large with Sub: This special case enables you
•
to effectively split a full range loudspeaker
into a "small speaker" plus "virtual subwoofer".
The HPF frequency and slope define the
characteristic of the "small speaker" portion.
LPF frequency and slope define the virtual
subwoofer characteristic.
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Should you wish to map a physical analog
output channel to a loudspeaker other than the
default assignment, you may do so from the Main
Speakers page. Click Output Mapping.
Mode, you may select
Using the New Output column on the right of the
pop-up menu, select a new output channel. If you
choose a currently occupied new output channel,
that channel will be automatically reassigned.
Save.
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Output Mapping