Sansui SE-99 Instructions d'exploitation Page 14
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Adjusting
reverberation
time
The reverberation
time
of
the
listening
room
is
one
of
the
major
fac
-
tors
which
influence
the
reproduced
sound
quality.
If
the
reverbera-
tion
time
is
too
short,
the
sound
will
lack
warmth
,
while
if
it
is
too
long,
the
sound
will
be "
muddy".
The
ideal reverberation
time
is be-
tween about 0.3 and
0.8
seconds, depending
on
the
size
of
the room.
Also,
it
should
be
the
same
for
all
frequencies
.
Reverberation is caused by certain frequencies being absorbed and
accentuated
due
to
the
dimensions
and
structure
of
the
room
when
the
sound
from
the
speakers is
attenuated
while
being
reflected
off
the walls and ceiling. Consequently,
the
necessary countermeasures
far
reverberation
will
vary
depending
upon
the
condition
of
the
listen-
ing room.
Try
improving
the
reverberation
time
while
referring
to
the
following.
A) High range
Generally,
most
audiophiles
tend
to
aim
for
sound
with
clearly de-
fined contours, and hence prefer a listening room having a short rever-
be
ration time. To
this
end,
it
is
normal practice
to
use a large
quantity
of
sound absorbing material in
the
room
(curtains, carpet,
etc.)
In
this case, there
is
no problem
if
all frequencies are absorbed
uniformly
,
however in many cases only the high frequencies are absorbed, result-
ing in a dull sound.
In
such a case,
the
reveberation
time
for
the
high requencies can
be
extended
by
using
curtains
and
carpet
with
short
hairs,
or
by placing
reflecting
panels in
front
of
the
curtains
in
the
rooms.
If
the
reverbeation
time
in
the
high range is
too
long,
the
sound
will
not
be adversely
affected
to
any
great degree.
It
can be
improved,
however,
by
using sound absorbing
curtains,
etc
.
B)
Middle
range
If
the
reverberation
time
in the
middle
range is
too
short,
the
sound
"penetration"
will
be degraded, and
for
the same
output
power
the
volume
wilt
tend
to
be
low
.
If
the reverberation
time
is
too
short,
objects
in
the
room
will
often
resonate in
this
range.
In
such a case, these
objects
must
be
found
and
removed
. This can be done
by
removing
objects
of
at
a least
a certain size
from
the
room
one
at
a
time,
and repeating meas-
urements.
Conversely,
if
the
reverberation
time
in
the
middle
range is
too
long,
the
sound
will
reverberate excessively. In
this
case, standing-
waves
may
sometimes
be set up. This can be
overcome
by
placing
a
box
of
about
one cubic
meter
containing
sound absorbing
material
(glass
wool,
etc.!
in each corner
of
the
room.
C)
low
range
The reverberation
time
in
the
low
range is nearly
always
too
long in
the
average listening
room,
and a
satisfactory
solution
is rather
difficult.
To
completely
overcome
this
problem,
it
is necessary
to
modify
the
walls
of
the
room. A
simpler
method
which
will
provide
some
degree
of
improvement
is
to
use larger
quantities
of
sound
ab-
sorbing
materials
than
are necessary
to
shorten the reverberation ti
me
in
the
middle
range.
Specifications~.
_______________________
_
Input
sensitivity
and
impedance
(1
kHz)
INPUT, TAPE PLAY-
l,2....
.
150mV
/
47
kohms
Output
level and
impedance
(1
kHz)
TAPE
REC
-
l,2
150mV
/ l .5
kohms
OUTPUT
...............
150mV
/ l .5 kohms
(Maximum
output
level:
5V
into
47
kohms
at
0 .5%
total
harmonic
distortion)
Total
harmonic
distortion
(at
2V,
20
Hz
to
20
kHz)
INPUT, TAPE
PLAY-l,2
.............
..
0.003%
Frequency response (at
0.5V,
Equalizer curve flat)
INPUT,
TAPE
PLAY·l,2
............
: ..
10
Hz
to
100
kHz,
+ 1.6 dB, -
2.0
dB
Signal
to
noise
ratio
(Short-circuit,
A-network)
INPUT, TAPE
PLAY·l,2
...............
120
dB
Equalizer freq.Jency
...........................
16
Hz,
32
Hz,
64
Hz,
125
Hz
,
250
Hz.
500
Hz,
1 kHz, 2
kHz,
4
kHz,
8
kHz,
16
kHz,
32 kHz
Level
variation
range
....................
.. . ±
12
dB
or
± 6 dB
Others
Power
voltage
..... .
..
....... .... .
'20V
,
220V
,
240V
(50
/
60
Hzl
For
U.S.A
. and Canada ..
,20V
(60
Hzl
Power
consumption
.
Dimensions ...... .
Weight
..
.
25
watts
..
......
.
.....
430
mm
(16-15
/
16
" 1 (WI
119
mm
(4·11/16
" I(HI
304
mm
'(11 · 15116 " 1 (DI
.
...............
5.3
kg
(ll.7Ibs)
net
6.6
kg
(14.6
Ibs) packed
• Design and specifications subject
to
change
without
notice
for
im-
provements.
•
Due
to
local
laws
and regulations.
this
unit
sold in
some
areas are
not
equipped
with
variable voltage selectors.
13
- OPERATING INSTRUCTIONS 1
- MODE D'EMPLOI 1
- INSTRUCCIONES 1
- I ESPAliioL I 3
- 0 0 0 0 0 4
- VOLTAGE 5
- SlUCTOfI 5
- VOLTAGE SELECTOR 5
- '" 6
- ________________________ 7
- ± 6 dB 8
- * The display 9
- "'" 10
- "" 11
- --- - - - - --- - 12
- I' 13
- _______________________ 14
- + 1.6 dB, 14
- Printed in Japan 15
- <48991800> 15
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