NAD T175 HD Owner's Manual page 23

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 effectively 'remove the walls with room
correction, and set the speakers for flat response, you may find 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 T 175
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).
USING THE T 175 – SETUP MENU
Select the Target Curve you find to be most satisfactory by pressing the
Audyssey key of the remote. The MultEQ XT corrected response can also be
bypassed if you wish.
It is recommended that you take full advantage of the T 175's Audyssey
Auto Calibration feature for your speaker setup. However, if you desire to
setup your speakers manually or if you already had run Audyssey Auto
Calibration but would like to make adjustments, the following sections on
Speaker Configuration, Speaker Levels and Speaker Distance can also be
followed and implemented.
NOTE
During manual setting of your speakers, previously calibrated
Audyssey settings could be retrieved by re-adjusting back the altered
configurations as highlighted by an asterisk.
OPERATION