Bedienungsanleitung NAD T 785 (Seite 22 von 52) (Englisch)

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AUDYSSEY 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 Audyssey Auto Setup and Calibration featured in T 785 uses a

microphone, along with sophisticated digital electronics built into your

T 785, to automatically setup and calibrate the T 785 to the exact speakers

and speaker placement of your own unique Home Theatre.

The following measurements are performed:

• Detection: Speaker conguration is detected including number of

surround speakers and whether a subwoofer and center channel is

connected.

• Size: T 785 crossover is set based on each channel’s signal handling

capability and the subwoofer crossover is automatically set.

• Level: SPL of each speaker is matched within 1dB at the microphone

position.

• Distance: is accurately set to within 1 foot (30 centimeters) of the

microphone for each speaker position.

• Polarity: the setup program will detect and notify the user if any

speakers are connected improperly. Incorrect polarity can ruin the

illusion of realism oered by surround sound.

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

case the calibration should be performed again.

AUDYSSEY MultEQ XT ROOM ACOUSTICS CORRECTION

Sound reecting from room boundaries can disturb the spatial illusion

of surround sound, and can also distort the tonal balance of the system.

Professional Acoustical Engineers often add wall treatments and even move

walls and relocate speakers to improve system performance, but for the

average Home Theatre, this is either too expensive or just not a practical

solution.

Audyssey MultEQ XT, using multiple measurements from the actual

listening positions, and processing this information using very sophisticated

digital signal processing, is able to “precondition” the signal to eectively

make the walls disappear. This creates a ‘family size’ sweet spot where the

sound and spatial cues are very accurately reproduced.

MultEQ XT is designed to tame room acoustics without changing the sonic

character of your loudspeakers. While it will make the most of whatever

loudspeakers you have, it will not make poor speakers sound like good

ones!

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

and the Audyssey Auto Calibration wizard will guide you through a simple

step-by-step conguration. Once setup and calibrated, the next greatest

improvement in performance is obtained by eliminating the acoustic

interference caused by room boundaries interacting with your speakers.

MEASUREMENT IS THE FIRST STEP

The sound at each listening position (up to 8 positions) is calibrated using

the same microphone used during the setup phase.

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

the T 785. The duration of calibration may take some time depending on

the number of speakers as well as the number of measuring points. After

all positions are measured, the DSP calculates the ideal system response for

your particular room and speaker setup.

If some inconsistencies or discrepancies are detected during the Audyssey

calibration, 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

Audyssey calibration again. When the measurements are nalized, Audyssey

calculates the ideal system response for your particular room and speaker

setup.

NOTE

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

bothersomeforyouandmayaectyourotherhouseholdmembersas

well,andevenyourneighbor.

OPERATION

USING THE T 785  SETUP MENU

ENGLISH FRANÇAIS ESPAÑOL ITALIANO DEUTSCH NEDERLANDS SVENSKA РУССКИЙ

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