Speaker Distance; Dirac Live - NAD T 778 Owner's Manual

OPERATION
CONFIGURING T 778 - SETUP MENU VIA ON-SCREEEN DISPLAY
Orient the meter with its microphone (usually at one end) pointing straight
up toward the ceiling (not toward the speakers) and ensure that "C"
weighting scale is selected. Set the meter to display 75 dB SPL. On Radio
Shack meters, this necessitates either setting the meter to its 80 dB range
and taking your readings at the -5 point or selecting the 70 dB range and
reading at the +5 point.
SETTING SPEAKER LEVELS AT TEST MODE
While at "Speaker Levels" menu, press the HTR 8 remote's [TEST] key
activating the T 778's Speaker Levels balancing test signal. You will hear
a "surf" sound as you step through your speakers ("Test Mode Active" is
shown besides the Speaker Setup heading), beginning with the Front Left.
If you do not hear the test signal, check your speaker connections or your
"Speaker Configuration" OSD menu settings.
Use the remote's [D/F] keys to adjust the loudness of the noise output
from the currently playing channel to the required level (it's usually
simplest to begin with the Front Left). As you cycle the test signal around
the speakers, the OSD will highlight the currently playing channel. The
"level offset" reading on the right will change by 1 dB increments; ±12 dB
adjustment is available. Press [ENTER] to adjust the next speaker.
NOTE
If you are balancing levels "by ear", choose one speaker—usually the
center—as a reference and adjust each of the others in turn to "sound as
loud" as the reference. Be sure that you remain in the primary listening
position while balancing all channels.
To produce the same SPL meter reading (or subjective loudness), use the
remote's [D/F] keys to adjust each speaker.
NOTES
• All speakers must be in their final locations before level-setting.
• Your subwoofer (if any) should be set with its integral crossover
defeated, or if undefeatable, set to its highest-possible frequency if
you are using the T 778's Subwoofer output. Final subwoofer-level
adjustment "by-ear, " using music and film sound material, is frequently
useful.
• Due to the effects of room acoustics, matched-pair speakers (front;
surround; back) will not always calibrate to exactly the same level offset
readings.
You can exit "Test" mode at any time by pressing [A] key, bringing you back
to "Speaker Setup" menu. You can also press the [TEST] key to discontinue
the "Test" mode.

SPEAKER DISTANCE

Your system's speaker distance settings are a subtle but important
refinement of your setup. Informing the T 778 of the loudspeaker-to-
listener dimensions of each speaker automatically imposes the correct
delays, optimizing imaging, intelligibility and surround-sound ambience.
Enter your dimensions with precision within about 1 foot (30 cm).
16
SETTING SPEAKER DISTANCE
While at "Speaker Distance" menu, use the [D/F] keys to individually set
each speaker distance as measured from the principal listening position to
the front surface of the particular speaker. Distance can be displayed as feet
or meters selectable at the "Unit of Measure" item. Distance can be set up to
30 feet or 9.1 meters.

DIRAC LIVE

The proprietary Dirac Live is integrated with your T 778. Dirac Live® is a
patented room correction technology that not only corrects the frequency
response, but also the impulse response of a room's loudspeakers. Dirac
Live provides true impulse response correction over a large listening area,
improving the depth, positioning and distinction of individual voices and
instruments. Using multiple measurement and mixed phase correction,
Dirac Live helps create a natural, realistic and transparent sound with
tighter bass and reduced room modes, in a way previously not possible.
Initiate Dirac Live by following below Setup Requirements.
T 778
•
Update your T 778 to the latest firmware.
• Speaker Configuration must match actual speaker setup – turn off
speakers that are not available.
• Both your computer and T 778 must be connected to the same
network.
MICROPHONE
•
The supplied measurement microphone can be connected to either
the MIC or USB input of your computer or the USB input of the T 778.
•
If the measurement microphone will be connected to the USB
input of your computer or the T 778, ensure that the measurement
microphone, phone jack adapter and USB MIC Sound adapter are all
connected together. The USB MIC Sound adapter is not necessary if the
measurement microphone will be connected to the MIC input of your
computer.
•
Minimize external noise such as talking, opening/closing of doors or
windows and playback of sound during the measurement.
• Use a microphone stand to firmly place the microphone in the
indicated measurement positions.
COMPUTER (WINDOWS, macOS)
• Both your computer and T 778 must be connected to the same
network.
•
Any active firewalls should allow HTTP (normal WWW access).
•
Turn off any computer programs that may make any noise.
•
Download Dirac Live App for Windows, macOS and smartphone
(iOS and Android) devices via T 778 software download page at
nadelectronics.com/dirac-live.
Launch Dirac Live App. Follow on-screen instructions.
Refer also to the HELP window for more detailed instructions.
View and follow simulated Dirac Live Calibration at:
nadelectronics.com/dirac-live
For further information about Dirac Live Room Correction technology, visit:
www.dirac.com/live-home-professional-audio-info