NAD 616 Manual Del Usuario página 7

THE DOLBY B & C.NOISE REDUCTION SYS-
TEMS
The deck is equipped with two types of Dolby noise
reduction. Dolby C NR provides the greatest quieting
of tape hiss, important when taping "live" musical per-
formances or recordings with a wide dynamic range
(digital Compact Discs, for example).
Dolby B NR provides optimum compatibility with
older tape recorders, portable and car stereo tape
players. Dolby B NR should also be used when play-
ing most pre-recorded music cassettes.
Each Dolby NR system is active both during
recording and play-back. Thus if a tape is recorded
with Dolby C NR, it must be played back with Dolby C
NR in order for the benefits to be obtained. Similarly,
if Dolby B NR has been used during recording, than it
should be used in play-back as well.
To avoid confusion, it is recommended that you
label each cassette Dolby B NR or Dolby C NR when
it is recorded, to indicate the type of noise reduction
used.
NOTE: After switching Power off, the Dolby NR cir-
cuits will default to off. Make sure you select the
appropriate Dolby NR setting again after switching
the deck on
Tape sensitivity is constantly changing as record-
ings are made due to the biasing effect of high fre-
quency audio signals. Dolby HX Pro is a system that
compensates for these undesirable fluctuations dur-
ing recording. It does not operate during playback, so
cassettes recorded with Dolby HX Pro can be played
back on decks not equipped with the system.
NOTE: Dolby HX Pro operates independently of
Dolby B NR and Dolby C NR, and only during
recording..
PLAYING BACK CASSETTES
The NAD 616 can play back tapes from both trans-
port A and B. Both transports have their own set of
transport controls such as Normal and Reverse Play,
Stop, Fast Forward and Rewind, located next to the
cassette compartments. As these controls perform
identical functions the numbering for these is the
same, but with a suffix of a or b, relating to either
transport a or b.
The transports can't play a tape simultaneously. If
e.g. transport A is playing a tape and Normal Play or
Reverse Play is engaged on transport B, transport A
will stop and transport A will commence playback.
Both transports can play tapes in normal and
reversed direction (Normal and Reverse Play), avoid-
ing the need to take the tape out of the compartment
and turning it around to play the other side. To avoid
confusion, it is recommended that you always insert
the cassette with the first side facing forwards.
• To load a cassette tape, remove it from its protec-
tive jewel case. Before inserting the cassette in either
transport A or B, ensure the tape is straight and taut
where it is exposed at the thick edge of the cassette.
N.B. If necessary, insert a pencil into either hub
and manually wind the tape spool until any slack is
taken up.
• Switch on the unit by pressing the POWER (1)
switch. After use, the unit can be switched off by
pressing the button again.
• Press the OPEN (3a or b) button to release the
cassette compartment door and insert the tape with
the thick edge - where the tape is exposed - down-
wards. The cassette tape is held in a carrier within
the door assembly. Refer to figure 2.
• Press the cassette compartment door shut until a
light "click" is heard. The tape is now in position.
• The tape can be removed by again using the
OPEN (3a or b) button.
Please note the button doesn't work during tape
travel.
• To re-set the tape counter (in the display) to
"0000", make sure the tape count for the right trans-
port is shown (indicated by a little A or B left of the
counter) and change if necessary by pressing A/B
(7). Then press the RESET (8) button.
• Select the appropriate DOLBY NR (14) position
(Dolby NR Off, Dolby B NR or Dolby C NR, shown in
display) to suit the particular tape you wish to play
back. Refer to the section "Dolby B & C noise reduc-
tion systems " for more information.
• Press the transport's corresponding Normal Play
(6a or b) or Reverse Play (4a or b) button to engage
tape transport. The Play icon or Reverse Play icon
in the display will light up to indicate the play sta-
tus.
• If the recording sounds dull, turn the PLAY TRIM
control (18) up (clock-wise) to restore accurate highs.
If the recording sounds edgy or sibilant, turn the Play-
Trim down to obtain smoother treble. Refer to the
section "The Play Trim Control" for further informa-
tion.
• Press the appropriate STOP (5a or b) button if
you wish to end play-back.
REVERSE MODE DURING PLAY-BACK:
Both transports sense when the end of one side of
a tape is reached and, when Auto Reverse (15) has
been engaged, will automatically play the other side
of the tape. If in both transports a tape is present, the
NAD 616 will first play one tape, and when finished
switch to the other transport and commence playing
of the other tape. Refer to the schedule overleaf for
all auto-reverse and continuous play possibilities.
NOTE: Reverse Mode will default to ON after the
deck has been switched off.
THE PLAY TRIM CONTROL.
Position the PLAY TRIM control in the "0" (centre
detent) position for normal play-back.
Errors in high frequency response often occur in
cassette recordings, especially in tapes that were
recorded on one machine and are being played on
another. These errors arise from tape saturation -
particularly those tapes recorded on decks without
HX Pro -, from biasing that didn't match the tape
when the recording was made, and from differences
in equalisation and head azimuth among recorders.
These errors cause mis-tracking of the Dolby NR
GB
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