NAD M15 HD2 AV Manuel du propriétaire télécharger pdf (Page 19)

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 M15 HD. 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.Ifyoucannot

withstandthetesttonelevel,itisadvisablethatyoustayawayfrom

theroomorlocationwherethespeakersarebeingcalibrated.Returnto

theroomorlocationaftereachcalibrationtochangethemicrophone’s

positionortonalizethecalibration.

NEXT A TARGET CURVE MUST BE CHOSEN

Because loudspeaker designers assume that their products will be used in

typical domestic rooms, they are ‘voiced’ to work in this environment. It is

assumed that the room will add some bass reinforcement and will absorb

some treble energy. Thus if we eectively ‘remove the walls with room

correction, and set the speakers for at response, you may nd this sounds

too bright in the treble and too weak in the bass region.

NAD engineers have done extensive research in this area of room acoustics,

and along with Audyssey engineers developed what we believe is the ideal

‘in room’ response curve. We include this NAD EQ, along with an Audyssey

developed EQ as the two best choices. The response curves shown below

typify NAD EQ room correction process.

Room Response measured by Audyssey microphone

Inverse Correction Filter calculated by NAD M15 HD

Corrected Room Response

Flat EQ is a third option, but not one that we recommend for listening

(it is useful for verifying system performance when using external

instrumentation).

OPERATION

USING THE M15 HD  SETUP MENU

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NAD M15 HD2 AV Manuel du propriétaire Page 19

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