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EN-15
DIRAC LIVE
There is a proprietary automatic loudspeaker
setup function built into your SA750 from Dirac
Research. Using a PC/Mac based application,
this attempts to set all the essential speaker
settings for all the speakers in your system. It also
calculates room equalisation (Room EQ) filter
values to remove some of the worst effects of
resonant frequencies in the listening room.
Your SA750 is supplied with a calibration
microphone, which should be inserted into a USB
socket on a PC or Mac connected to the same
network as the SA750 and positioned as directed
by the Dirac Live for JBL PC/Mac application.
This microphone picks up the special calibration
tones generated by the speakers when Dirac
Live for JBL application is run. The SA750 then
analyses the signal and will correct any resonant
frequencies in the room which need control by
filtering.
To help the system be as accurate as possible
when performing Dirac Live for JBL setup, there
are a few guidance rules that should be followed:
Minimise any background sounds in the
listening room and other nearby rooms.
Close all windows and doors in the listening
room.
Turn off all fans including air-conditioning
systems.
Mount the microphone on a tripod or similar.
Position the set up microphone pointing
upwards at roughly head height in the normal
listening position. It is not necessary to point the
microphone directly at the speaker generating
the test tone. (It helps if you are able to position
the microphone exactly where your head would
normally be for listening, with the microphone in
direct unobstructed view of all speakers.)
When activated, a calibration tone is played
through each channel of the SA750. The
calibration tone cycles round each of the speakers
multiple times as the different parameters are
calculated.
Note: By default, Room EQ is not applied to any of the
source inputs.
You should enable Room EQ on inputs you think
benefit from this feature, as required, by listening
when playing typical source material through each
input. After being calculated, this is enabled from
within the setup menu or by the front panel or
remote control button.
While room equalisation can help to reduce
problems with listening room acoustics, it is
usually far better to try to solve these problems
with the room directly. Proper loudspeaker
positioning, acoustic wall treatments and moving
the listening position away from walls should
produce far better results overall. However it may
be difficult to do this in a home environment, so
Room EQ is your next best choice.
Problems
The Auto Speaker Setup function is normally very
accurate but occasionally false results can be
generated. Problems may be as a result of:
external sounds or rumbling/handling noises
picked up by the microphone
sound reflections off hard surfaces (e.g.
windows or walls) close to the listening position,
very strong acoustic resonances within the
room,
obstacles (such as a sofa) between speakers
and the microphone.
If you are still experiencing difficulties or you wish
to have the most accurate results for ultimate
surround performance, we recommend using the
manual method of establishing speaker distances
and levels.
Downloading the Dirac Live
application
To download the Dirac Live for JBL PC/Mac
application and quick start guide, please visit:
live.dirac.com
Using Dirac
You can store up to three Dirac EQ curves in the
SA750. Each input can use a different curve, for
example a “Movie” curve on the BD input and
“Music” curve on the CD input.
This can be set on a per input basis using the
key on the front panel or key on
the remote.
Alternatively use the Dirac menu in the Audio
settings menu to set the curve for each input. See
"Dirac Curve" on page EN-17.
Note: When Dirac is run for the first time the
curve will be applied to all inputs. Subsequent
curves will not be automatically applied, use the
methods above to choose the required curve for
the input in question.
When Dirac is being used the icon will be
shown on the display.
15


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