NAD S170i Manuel D'installation page 24

USING THE S170i
DOLBY EX, DTS ES, THX EX, SURROUND 6.1
Multichannel digital recordings (Dolby Digital or DTS) are reproduced via the full suite of front, surround,
and one or two "back"-channel speakers (if selected in <Speaker Setup>). If Dolby Digital EX/DTS ES
encoding is present in the original recording its logic is used to derive the back channels; otherwise, the
S170i preamplifier derives a single back-channel signal from the left/right surround channels.
DOLBY PRO LOGIC
Surround-encoded recordings (and stereo recordings that are not encoded ) are reproduced with Pro Logic
Dolby Surround decoding, with output to left, center-, and right-front channels and a single monaural
surround signal sent to both surround-channel speakers; the surround channel's response is rolled off
above 7 kHz to discourage localization of surround-speaker locations in DPL mode).
Pro Logic mode is best reserved for surround-encoded recordings intended for Dolby Surround or
compatible-system reproduction. These include most films on videotape and many on LaserDisc,
television/cable programming produced for surround-sound, and most older LaserDiscs. Most DVD
recordings, even those that do not exploit multichannel surround, include a Dolby Digital and/or DTS
soundtrack in 1- or 2-channel modes; where available, this will usually deliver better performance. With
rare exceptions, NAD's proprietary EARS listening mode will produce superior results from stereo music
recordings than will Pro Logic.
DOLBY PRO LOGIC II MOVIE
Similar to Dolby Pro Logic, this improved algorithm applies logic after the matrix decoding, rather than
before as in Pro Logic, improving image stability and the precision of signal steering. Surround channels
are also run full range.
DOLBY PRO LOGIC II MUSIC
Fine tuned for listening to music, in this mode the surround channels response is rolled off to simulate the
acoustic absorption of a typical room. In addition, there are several adjustments that can be made to
enhance the listening experience:
PL II Panorama When selected the Panorama setting wraps the sound of the Front Left and Right
speakers around you for an exciting effect.
PL II Center Width Center Width allows you to gradually spread the Center channel sound into the Front
Left and Right speakers. At the widest setting all the Center speaker sound is mixed to the Left and Right
speakers. This control may help achieve a more spacious sound, or a better blend of the front image.
PL II Dimension Dimension adjusts the front/back balance to taste.
DTS NEO:6 CINEMA
Surround-encoded recordings (and stereo recordings that are not encoded ) are reproduced with DTS
Neo:6 Surround decoding, with output to left, center-, and right-front channels, and surround and
surround back channels (if selected).
DTS NEO:6 MUSIC
This music surround mode can be used to create a convincing surround sound experience using front,
center, and all selected surround speakers from any 2 channel stereo source. Neo:6 allows the user to
adjust the Center Image in six steps. Center Image allows you to gradually spread the Center channel
sound into the Front Left and Right speakers.
24