Tascam DA-78HR - Manual (Page 8)

1 - Introduction to the DA-78HR
8
TASCAM DA-78HR
We suggest that you make a special note of the sec-
tion 1.4, “Precautions and recommendations” as
these contain some information which is unique to
the DA-78HR.
We also suggest that you also read , as this will help
you when you come to perform basic operations.
When referring to a control or a connector on the
DA-78HR, the name of the control or connector will
be written in bold type, and may be followed by a
number, as in the example below:
Holding down the PLAY key C and pressing
the REC D
key will start the recording pro-
cess.
The numbers refer to the front and rear panel illustra-
tions and description in this manual.
When referring to a word or phrase which appears on
the display, the word or phrase will be written as
follows:
MEMO. 1 ( MEMO 1 ).
If on-screen parameters are given as part of a display
example, they may sometimes be shown in the fol-
lowing way, where the
;; represents an unknown
value:
ID SEL ;; ( ID SEL xx ), where xx is the
machine ID
NOTE
Recording is an art as well as a science. A success-
ful recording is often judged primarily on the quality
of sound as art, and we obviously cannot guarantee
that. A company that makes paint and brushes for
artists cannot say that the paintings made with their
products will be critically well-received. TASCAM can
make no guarantee that the DA-78HR by itself will
assure the quality of the recordings you make. Your
skill as a technician and your abilities as an artist will
be significant factors in the results you achieve.
1.4 Precautions and
recommendations
As with any precision piece of electronic equipment,
common-sense precautions apply with the DA-
78HR.
However, there are a few extra precautions which
apply to the DA-78HR, and we suggest that you
make a note of these, to prolong the useful life of the
DA-78HR.
1.4.1 Clock source in a digital studio
The DA-78HR can be used in a variety of situations,
and with a variety of equipment, either digital or ana-
log.
If you are working with more than one digital audio
unit in your setup, you should note that all units must
be driven by the same central clock source (“word
clock” or “word sync”).
If different word clock sources are used throughout
the setup, it is actually possible to damage speakers,
etc. because of mismatches.
The DA-78HR can be designated as the word clock
master for your studio, or can be slaved to external
word clocks, using a convenient front-panel switch
and standard BNC connectors.
Even though AES/EBU stereo digital audio signals
are self-clocking, any AES/EBU format signals con-
verted and fed to or from the DA-78HR must be syn-
chronized at word level with the DA-78HR.
1.4.2 HR recording and emphasis
Recordings made in 24-bit (HR) mode do not use
emphasis.
If an attempt is made to record a digital signal that
contains emphasis using either the TDIF or the
SPDIF digital audio inputs, the display shows
E
EMP
( E EMP ), and the signal is muted.
A digital emphasis circuit is provided, however, for
compatibility with previous models of DTRS
recorder.
Note that if a recording using emphasis is dubbed to
the DA-78HR via the analog inputs, this signal will
need to be modified appropriately.
1.4.3 Environmental conditions
The DA-78HR can be operated in most environ-
ments, but we suggest that you keep the environmen-
tal conditions within the following limits:
• Ambient temperature between 5
°
C and 35
°
C (41
°
F
and 95
°
F).
• Relative humidity should be between 30% and
80% non-condensing
• There should be no strong magnetic fields (speak-
ers, etc.) near the DA-78HR.
• Avoid spraying polish, insecticides, etc. near the
DA-78HR.
NOTE
If you need to clean the DA-78HR, use a soft cloth,
moistened if necessary with a little detergent and