Pioneer SC-100 Руководство по эксплуатации - Страница 10
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ABOUT VOLUME CONTROL (3) AND ATTENUATOR SWITCH
(10)
Ahighprecision
step-type attenuator switch which
can be used. even
for
professional
broadcasting
units is
ernployed
for the
volurne
control of this unit.
This type
of
attenuator, however, can not provide
continuous
control of the
sound volurne-
strictly
speaking. This inadequacy presents an acoustic problern
in
such cases
when
a
recordplayer
equipped
with
a cartridge of high
output
voltage
or
a
basic arnplifier
of
high gain
is
used
in
cornbination
with this
SC- 100.
In
other
words,
sound.
will
not
ccirne
out
frorn the
speakers when the volurne
control
is
set to the rnaxirnurn
cut-off
point(
oo )
but
sound rnay be
tooloud
if
the volurne
controlis
set
to
one step higher
position
tr-60rr.
To solve
this
problern,
it is
recornrnend.able
for
you
to
set
the attenuator
(I0) to
-15
dB or -30 dB
so
that
ideal volurne
rnay be obtained
with the
volurne
control
set to
il_(;0il.
Note:
Difference
in sensitivity
of basic
arnplifiers
can
be
explained.
frorn
the fact
that
sorne
basic arnplifiers
with
30 W
output
require
the input
of
1
V to
take
out
the
30
v/
output
while others require
the input
of only o.z
y.
Although you can adjust
the input level if
your basic
arnplifier is
provided
with the
volurne control
for
such
a
purpose,
it is still
recornlrlendable
for
you
to adjust the input
leve1
with the attenuator of
the SC-100.
ABOUT THE TONE
CONTROLS
The characteristic of the controls
used
in the
SC-100
is basically different frorn
that of ordinary
tone controls whose response curve
varies
continuously. As
shown
in the characteristic
graph, only
necessary
f
requencies
are
selected
with the
con-
trols
to
rnake thern enhance
or
attenuate.
At
the
sarne
tirne,
the
varying quantity
of
the
rniddle range
is
considerably suppressed. Flence,
if
the tonal
quality
of the
re-
produced
sounds
frorn
both the
left
and
right
speakers
is
not
equal due
to
the back-
ground
conditions,
it is
adjustable
with
the tone controls.
Since
the sensibiiity of
hurnan
ears
is
weak
to lows
and
highs,
it is
recornrnendable
foryouto raise
both the high
and 1ow
frequencies
a
little
when
the reproduced
sound
level
is
low.
I