Bedienungsanleitung JBL SA750 (Seite 15 von 22) (Englisch)

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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.

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