Focal ASTRAL 16 User Manual page 29

ASTRAL 16
U s e r m a n u a l
9. Configure Microphone
Choose the Recording Device UMIK-1 (A). Load
the microphone calibration file (B) downloaded
in step "3. Prepare Calibration Hardware". Use
"..90degree.txt" when placing the microphone
in an upward facing direction. It is wise to save
the project (C) along each step of the calibration
in order to make recovery from interruptions
easier. Also, measurements can be reused in
order to regenerate a new filter design following
adjustments to the target curve. Click Proceed to
Volume adjustments (D).
C
A B
10. Set Levels
B A C
™
C
A
B
D
D E
Now that the microphone is connected, ensure
that the room is quiet. Adjust the input gain to
100% (B). Set the output volume (A) to a low
level (-40dB for example). Start the test noise by
pressing the PLAY button (C) on the first channel
and adjust the volume to reach the green area in
the channel's meter. For each channel, activate
the test noise and correct the channel volume
using the corresponding slider (D) so that the
meter reaches the green area. Note that all
channels are automatically listed and subwoofers
are automatically identified. Remember that it is
important that multi-way speakers and subwoofers
have already been
grouped therefore will appear as one loudspeaker.
Click Proceed to Select Arrangement (E).
11. Measure Acoustic Response of Sweet Spot
Place the microphone in the exact sweet spot of
the room at ear level to begin. It must be in the
left-to-right center of the room since it will be used
for loudspeaker distance and level calculations.
Select the arrangement you wish to define. Chair
is for a single listening position, Sofa Focused is
for a wider listening position still focused around
the listener and Sofa Wide Imaging for a wider
area with more microphones positions. Start the
measurement by pressing Proceed to Measure
button. The measurement waveform graphic is
updated in real time.
Focal recommends to use DIRAC Live to fine tune
the sound (EQ), since DIRAC allows to keep phase
consistency.
We strongly recommend to save your project
before leaving DIRAC. Without backup, each
future modification will require a complete redo
all procedure.
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individually aligned and