Sea Preset Patterns; Compensation For Room Acoustics; Compansation For The Characteristics Of Components - JVC JR-S400 MARK II Lnstruction Book

ADVANCED
S.E.A. PRESET PATTERNS
Try these patterns
to
increase
your
listening pleasure
with
diff€rent types
of
music. These are
suggestions
from JVC
ol
settings
which will be most
suitable
for
these
types
ot
tunes,
SOME MORE ABOUT S.E.A.
JVC1 oxclurivo tons control
system
S.E.A. splits the
receiver's
output into five
frequency
bands
with
center
frequencies
of 40, 250,
1,000, 5,000
and
15,000H2.
The conools
have
click
positions
above
and below the center
or FLAT
position
so
that
the
re-
sponse
in
each
band
can be
varied by
ll2dB.
40Hz
Boost
to
brinq
out
the rich
tones
of
su€h in-
struments
as
the organ,
25OHz
Soost
to
add clarity
to
upper bass sounds
such as
woodwind
instruments and
cel.los.
Cut
to eliminate
speaker
boom.
1p00Hz
Effective
to
emphasize
or
deemphasize the
human voice and
certain
instruments.
5,000H2
Boost
to
add
clarity
to trumpets and violins.
Cut to
reduce upper mid.ranqe response.
15,m0Hz Boosts hish frequency response and sives
a
feeling
of
presence.
S.E.a.
makes possible more
flexible control
ov€r
tone
so
that
various
special
effects
can be
obtained
that
were
not
possible with
conventional
bass and
treble tone control
systems.
With S.E.A.
used
judiciously,
the
sound can
be tailored
to
compensate for the acoustlc
propenies of
your
listenlng room, rhe
characterlstics
of your
audio
sysrem and
rhe properries
of
different
types
of
/nLsk.
Compensation
lor
room
acousiics
Rooms
with many curtains and furnkhi6gs tend to
absorb
low frequency
sound, in
which
case
the 40Hz
and
250H2
controls
should be boosted.
ln
rooms which
are
relatively
sparsely
furnished, sound is ref ected. In
small
rooms highs tend
to
be emphasized
and
in
larg€ rooms,
lows.
These
different prope(ies
can be
compensated
for by proper
adiustment
of
S-E.A.
Compe$ation
for
the ch6ractoristica
of
component3
Almost all moving
magnet
cartridges have peaks ln their
response
curves between 10,000
and
15,000H2
and
produce
harsh high frequency sounds.
Speakers
also
are
not
always perfect- Some
airtight
enclosures
reprod!ce
low freqlencies
below 'l00Hz poorly
and cause
harsh
sounding midrange
and high
frequencies.
These charac-
teristics
of
audio systems, which cannot be compensated
for
by
conventional tone
control
systems,
can
be
per
fectLy compensatFd
for
by S.E.A.t'ive conr,ols.
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