Bedienungsanleitung NAD T 747 (Seite 24 von 42) (Englisch)

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AUTO CALIBRATION

It has been shown that many, if not most, surround sound systems are not

accurately setup and calibrated. To be done properly, calibration requires

special knowledge and instrumentation that the average person probably

doesn’t possess.

The Auto Calibration featured in T 747 uses a microphone, along with

sophisticated digital electronics built into your T 747, to automatically setup

and calibrate the T 747 to the exact speakers and speaker placement of

your own unique Home Theatre.

The following parameters are automatically measured and adjusted

accordingly.

• NoiseLevel: Check noise level relative to each speaker and subwoofer.

• NumberofSpeakers: Speaker conguration is detected including

number of surround speakers and whether a subwoofer and center

channel is connected.

• SpeakerDistance: Accurately set the appropriate distance of

each speaker position as well as the subwoofer with respect to the

microphone position.

• SpeakerLevelandSize: T 747 crossover is set based on each

channel’s signal handling capability and the subwoofer crossover

is automatically set. SPL (Sound Pressure Level) of each speaker is

matched with respect to the microphone position.

• Equalization: Adjust tonal quality (bass/treble level) for each speaker.

This applies to all sound elds and for each speaker.

This is a one-time set up, unless speakers are moved or changed, in which

case the calibration should be performed again.

MEASUREMENT IS THE FIRST STEP

Connect the microphone jack into the front panel’s MP/MIC input. Place

the supplied microphone in the listening position at about the same

height as your listening ears. The microphone has a threaded insert at its

base that makes possible for it to be mounted on a tripod.

The sound at your main listening position is setup using the supplied

microphone. Depending upon the availability of speakers, you can

select either 7.1 or 5.1 setup. Upon selection of either 7.1 or 5.1, the auto

calibration starts – refer to the OSD as auto calibration steps through each

measurement parameter.

A special test tone is sent to each speaker and the data is memorized

by the T 747. The duration of setup may take some time depending on

the number of speakers. After the measurements, the T 747 calculates

the ideal system response for your particular room and speaker setup. If

some inconsistencies or discrepancies are detected during the setup, the

process maybe interrupted or the problem is shown in the particular setup

window. A notice screen is correspondingly displayed. After following and

undertaking the displayed instructions, re-start the Auto Calibration setup

again. When the measurements are nalized, the ideal system response is

calculated for your particular room and speaker setup.

NOTES

• Autocalibrationispossibleonlyfora7.1or5.1speakerconguration.

For other speaker congurations, like a 2.1 setup, you have to

manually set them up by referring to the guidelines below for Speaker

Conguration, Speaker Distance and Speaker Levels.

• Thetesttoneemittedduringmeasurementisloud.Thismaybe

bothersome for you and may aect as well your other household

members and even your neighbor.

ABOUT EQUALIZATION

Equalization is one of the parameters automatically adjusted when the

Auto Calibration feature is initiated. If after Auto Calibration, the resulting

equalization eect does not suit your taste or preference, you have the

option to turn o such equalization eect. Below is the procedure on how

to turn o equalization.

1 Ensure that auto calibration is completed. Equalization cannot be

turned ON or OFF if auto calibration is not performed and completed.

2 Using the AVR 3 remote control and with Device Selector set to AMP

page, direct the AVR 3 to the T 747’s remote sensor.

3 Press and hold AVR 3’s TEST button until the upper line of the VFD

shows “Adjusting EQ” and the lower line “OFF”; equalization is now

turned OFF.

4 If you decide to turn ON again the calibrated equalization eect, press and

hold AVR 3’s TEST button until the upper line of the VFD shows “Adjusting

EQ” and the lower line “ON”; equalization is now turned back ON.

OPERATION

USING THE T 747  SETUP MENU

ENGLISH FRANÇAIS ESPAÑOL ITALIANO DEUTSCH NEDERLANDS SVENSKA РУССКИЙ

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