3.3
Which noise reduction
system?
The choice of the
noise reduction system
is very simple:
For all
new recordings use Dolby
C. lts signal-to-noise
ratio is
much
better than
with Dolby B. Dolby
B
should be
used only
when
playing
existing
recordings and
when
appending
new
recor-
dings to cassettes
already
recorded with Dolby B.
Dolby C
re-
corded
cassettes
may
be
played
backwith a
minor audio
quality
loss in
recorders equlpped with Dolby B only
(e,9.
by car
cas-
sette
players:
noisier, frequency response error),
3.4
Automatic
alignment
The REVOX
B2rl5 cassette
recorder
is able to align
itself optimal-
ly to the
type of tape
used, Since
tape-related data
are
automati
cally stored
and retrievable
as
required. it
is recommended
to
perform
the alignment
procedure
for the
brand
of tape
used.
The
following
memory locations
are available
for the
various
tape
types:
IEC I 2 memory
locations
41 and
,A2
IEC
ll
3
memory
locations
A1, A2, and 43
IEC
lV 1 memory
locations
41
Alignment
-
lnsert cassette.
-
lf
the
inserted cassette
is
not coded according to
IEC
(referto
Section 3.'1),
the corresponding
standard
can be selected
by
pressing
the
TAPE TYPE
[17]
button.
-
Select
the
memory location
in which the cassette
data
are to
be
stored by
pressing
ALIGN
[20]
(appears
in the display
[11]).
-
Prepare
the RECORD
mode
(press
REC
[2]
and PAUSE
[7]).
-
Press
ALIGN
[20]
button.
the alignment
process
starts.
The
11 2'15 CÄSsäTTH
..
TApg .,.i$Fg.t{,,.ir,,i:,r,i:'']'''',,iii':
tape is automatically
rewound to the start
position
upon con-
pletion
to the
alignment,
and
the corresponding tape
data are
written into the selected
memory.
-
Since
alignment
is necessary only once
for each cassette
type, the
corresponding memory
location
should
be
remem-
bered.
The alignment is only usefulif the corresponding
align-
ment data
related
to the cassette type are
recalled.
Note:
Alignment should
not be
made at the very start
of a tape be-
cause some
tapes have
damaged
magnetic coating
just
after
the leader
tape.
lf for
any
reason the
recorder is unable to
per-
form the alignment.
it is indicated bytheflashing
word
ALIGN on
the display
[10].
ln
this
case, the recorder
is
blocked
until a tape
command
is entered as an acknowledgment.
The
previously
stored
alignment data
will then
remain
available.
For subse-
quent
recordings, always use the same
noise
reduction system
during
the
alignment
(compensation
for the Dolby circuit).
For
poor
or damaged
cassettes, alignment should
be
performed
without
noise
reduction
system.
Possible trouble sources:
-
Cassette
tape on transparent
leader
-
Wrong tape
category
selected
-
Dirty soundheads
-
Defective
tape
Recall of
alignment data:
-
When changing
to a different type of tape, the corresponding
alignment
data
should be
recalled.
-
Check
whether the correct cassette type is
indicated on the
display
[10].
otherwise it
should
be selectgd
with
the
TAPE
TYPE
[17]
button.
-
Press
ALIGN button repetitively until the memory
location
containing
the corresponding alignment data is shown on
the
display
[11j
By
following this
procedure,
the cassette
recorder
is always 6ptimally calibrated
for recordings.
10
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