NAD T741 - Manual (Page 18)

GB
18
TIPS FOR SETTING DELAY
Measure the distance from the listening position to the center speaker
(dC) and to one of the front speakers (dFL or dFR). Subtract the center
channel distance from the front L or R channel distance. For example, if
the front speakers are 12 feet (3.7 m) from the listening position and the
center speaker is 10 feet (3.0 m), the difference is 2 feet (0.6 m). For this
example the center channel delay is set to 2 milliseconds or ms.
The T741 can delay the center channel output up to 5 milliseconds and
thus compensates for center channel speakers that are up to 5 feet
(1.5m) closer to the listening position than the front left and right
speakers.
NOTES
In rare system setups, the center channel speaker is actually further
away than the front left and right speakers. In these cases, set the
center channel delay to 0mS. The center channel delay time
adjustment is only available in Dolby Digital surround mode.
Measure the distance from the listening position to either the left or right
rear speaker (dLS or dRS). Subtract the rear speaker distance from the
front speaker distance (dFL or dFR). The resulting distance is equivalent to
the delay in milliseconds for the rear delay setting. For example, if your
rear speaker distance is 6 feet (1.8 m) and the front distance is 12 feet
(3.7 m), the correct rear channel delay setting is 6 milliseconds. Again, set
the rear channel delay to 0mS if the rear channels are further from the
listening position than the front speakers.
In Dolby Digital surround mode, the rear channel delay time can be set
from 0ms to 15ms with 1ms increments. In Dolby Pro logic surround mode,
the rear channel delay time can be set from 15ms to 30ms and 1ms per
step. In DTS surround mode, the channel delay time cannot be adjusted.
LEVEL SETTING (CHANNEL BALANCE)
The output levels of each of the speakers connected to the T741 may
need to be adjusted so that there is an even balance of sound from all
the speakers in the system. If, for instance, the relative volume level to
the Left and Right speakers and the center speaker is set too low, most
of dialogue may be difficult to follow. If, on the other hand it is set too
loud, the over-all balance will sound unnatural.
To adjust the channel balance, the T741 is equipped with a TEST button
(No.
7) on the Remote Control to help assess the loudness levels of each
speaker. Before adjusting the channel balance level, make sure the
master volume is turned down to a normal listening level.
Pressing the TEST button engages the Test signal generator to allow for
adjustment of all speaker levels, so that each channel can be adjusted for
equal loudness at your listening position. The test signal scrolls
automatically with 2 second intervals from Left, Center, Right, Rear Right,
Rear Left, to sub-woofer in continuous cycles. If an adjustment in set-ting
is made for one of the speakers, scrolling will stop until 2 seconds after the
adjustment was made. The display panel shows which speaker is being fed
with the test signal. Use the VOLUME +/- buttons on the Remote Control
to respectively increase or decrease the level for the current speaker.
NOTE
There is no output in the Subwoofer during noise sequencer operation;
therefore it is difficult to adjust the level in test mode. The Subwoofer
level can be adjusted in the setup menu with musical input.
The Channel Balance for each speaker can be adjusted in 1dB
increments. Continue to calibrate the level for each speaker until equal
loudness is achieved at your listening position. A more accurate
adjustment can be made using a sound level meter, if available. Set the
meter to “Slow” and “C-weighted” modes and re-check the settings
with the meter placed in several different positions in the general
listening area.
Press the TEST button again to leave or cancel the Test mode, any
changes will be memorized automatically.
Select the channel for which you wish to adjust and set the level so that it
matches the other speakers. For best results it is best to start with the Left
channel set at 0dB and to match the other speakers to it. Normally, if the
Right speaker is located at the same distance from the listening position to
the Left speaker it should be set at the same level as the Left speaker.
NOTE
If no level adjustments were made, press TEST again to return to the
selected source. Any changes in the Channel Balance Setting, under
the test mode, will be memorized automatically.
The Delay time for the Surround speakers also needs to be correctly set
for your normal listening position. Refer to the section “Channel Delay”
in this chapter for more information.
T741 manual (GB) 22/10/01 3:56 pm Page 18