Technics RS-B655 User Manual

About the Dolby noise-reduction
recording/
playback
system
The Dolby noise-reduction system
is a system designed to
effectively
reduce the annoying high-frequency
"hissing" noise
typically
heard from tapes
if
this system
is not used. During
recording, the system functions to
increase the level
of the
high{requency
part
of
the
sound, and
then, during
playback,
that
same
portion
is weakened and returned to the
previous
level. This
unit
includes two types of Dolby
noise-reduction
systems,
the
Dolby B NR-type and C
NR{ype, and Dolby HX
PRO
headroom
extension system.
f Dolby B-type noise-reduction system
Noise is reduced to about one-third.
Use
this system
when
playing
back
tapes recorded by the Dolby B
noise-reduction system, such as
prerecorded
music tapes, etc.
I Dolby
C-type
noise-reduction system
Noise
is reduced to
about one-tenth.
Use
this system for the recording and
playback
of sound sources
that have a
wide
dynamic
range
and
good
tone
quality,
such as
FM
broadcasts of
live
performances,
etc., and
for
playing
back such
tapes.
t Dolby HX PRO headroom extension system
By functioning
to
improve
the
maximum
output
level
of
the tape's
high{requency range, this
system
permits
recordings
without
a
drop of
the level
of the sound source's
high{requency range. In
addition, by using the system in
parallel
with
this unit's
noise-
reduction
system,
recording
and
playback
with a
greatly
extended
dynamic
range is
possible.
Dolby noise
reduction and HX
P.ro headroom
extension
manufactured under
license from
Dolby Laboratories
Licensing Corporation.
HX Pro
originated
by Bang &
Olufsen.
"DOLBY",
the double-D
symbol
D0
and
"HX
PRO" are
trademarks of
Dolby Laboratories
Licensing Corporation.
The counter-mode button
can be
oressed
to select either of
the
counter-display
modes
(see
below):
the tape-counter display or the
linear-counler
display.
(Note
that the linear-counter display
appears when the unit is
turned ON.)
When the counter-reset button
is
pressed,
"0000" is reset,
regardless of the setting of
the counter-mode button.
I Tape-counter display:
This
display shows
the amount
of tape movement as a series
of consecutive
numbers.
The
display changes alternate-
ly each time the counter-mode
button
is
oressed.
I Linear-counter display:
This
display shows the
amount
of tape movement
as
express-
ed
minutes
and
seconds.
Minutes
Seconds
oThe
linear-counter
display
is
particularly
convenient when
you
want
to know how much time is remaining for a tune now
playing
or
you
want
to know
how
much
recording
time is remaining.
Notesl
.The
counter reading
will return to
"0000" when the unit is turned
OFF.
oThe
linear
counter of
this unit does not function as a clock.
Depending on the length of the tape used, the diameter of
the
cassette's hubs, etc., there
may
be a ditference between
the time
displayed by
the
counter and
the actual recording or
playback
time.
<Difference
when an ordinary tape
is
played
on
one side
from
beginning to end>
Cassette type
Approx.
diflerence
C46
(large
hub), C60,
c90
-30-+30
seconds
C46
(small
hub) +2 or 3 minutes
oThe
linear
counter
will
display a minus
reading if the counter is
reset
to
"0000"
and the taDe is then rewound.
Examole:
"-00.01"
(linear
counter) Counter
reset: "0000"
Tape
r,
-J
-t
LI
L
'_
flt
I
I
I,
C
_,
I
I
Rewind
-7
-

Technics RS-B655 Specifications

Power

power consumption	21 W
power supply frequency	50 Hz/60 Hz
power supply voltage	240 V

Audio Specifications

wow and flutter	0.05% (wRMS)
frequency response (Normal)	20 Hz-18 kHz
frequency response (CrOz)	20 Hz-18 kHz
frequency response (Metal)	20 Hz-19 kHz
S/N ratio (Dolby C NR on)	74 dB
S/N ratio (Dolby B NR on)	66 dB
S/N ratio (Dolby NR off)	56 dB

Weight and Dimensions

dimensions	430x135x290 mm
weight	4.9 kg