1 – Introduction to the DA-98HR–Notes and precautions
TASCAM DA-98HR
9
that you make a note of these, to prolong the useful
life of the DA-98HR.
1.4.1
Clock source in a digital studio
The DA-98HR 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-98HR 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 fed
to or from the DA-98HR must be synchronized at
word level with the DA-98HR.
1.4.2
Confidence replay
Because the DA-98HR can accept digital data at dif-
ferent sampling frequencies, and the word length is
may be either 16 or 24 bits, monitoring the input
source during recording will not necessarily provide
a completely accurate representation of what is
recorded on tape.
The DA-98HR provides a dither setting (7.12.1,
“Selecting dither settings”) which provides improved
total harmonic distortion figures for 16-bit recording.
Since the dither is applied prior to recording, again,
monitoring the input source will not allow you to
hear the effect of the dithering process.
Accordingly, the DA-98HR provides a confidence
mode, allowing you to monitor off-tape as recording
progresses. Since this monitoring is not synchronized
exactly with the source inputs, gapless punch-in and
punch-out is not possible in confidence mode. For
full details of confidence monitoring, together with
other monitoring modes available on the DA-98HR,
see 5, “Monitoring modes”.
1.4.3
Environmental conditions
The DA-98HR 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
°
and 35
°
C (41
°
and 95
°
F).
Relative humidity should be between 30% and 80%
non-condensing
There should be no strong magnetic fields (speakers,
etc.) near the DA-98HR.
Avoid spraying polish, insecticides, etc. near the DA-
98HR.
NOTE
If you need to clean the DA-98HR, use a soft cloth, moist-
ened if necessary with a little detergent and water. Do not
use abrasive cleaners or solvents such as alcohol or
thinner.
Avoid subjecting the DA-98HR to jolts, sudden
shocks, etc.
NOTE
If you have to return the unit for service or repair, use the
original packing materials if possible. If the unit is to be
transported to a recording location, etc., use a suitable
transport case with sufficient shock protection.
TASCAM does not accept responsibility for damage
resulting from neglect or accident.
1.4.4
Installing the DA-98HR
The DA-98HR may be installed in a standard 19”
rack, occupying 4U of space. Since the DA-98HR is
quite heavy (around 11kg – 24lb), your rack should
be strong and stable to take the weight of the DA-
98HR.
The DA-98HR should be mounted with the front
panel vertical.
1.4.5
Electrical considerations
Make sure that your local power supply matches the
voltage requirements marked on the rear panel of the
DA-98HR.
If you are in any doubt concerning the local power
supply, consult an electrician.
