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APPLICATIONS OF SEA SYSTEM
ANWENDUNGEN
DES SEA-SYSTEMS
UTILISATIONS DU SYSTEME SEA
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Soateret (Hz)
Frequenz (Hz)
Fréquence
(Hz)
88
Level
(dB} Pegel
(dB) Niveau
{dB}
— 40)
Example of transmission
response in a room
Ubertragungs-Charakteristika in einem Raum
Exemple de réponse de transmission dans une salle
Level
{dB) Pegei
(dB)
Niveau
{dB)
Frequency (Hz)
Frequenz (Hz)
Fréquence
(H2)
Example of transmission
response ina
hall
Ubertragungs-Charakteristika
in einer Halle
Exempie de réponse de transmission dans un halt!
Level
{dB)
Pegel
(dB)
Niveau
(dB}
Frequency
(Hz}
Frequenz (Hz)
Fréquence
(Hz}
Example of transmission
response in a room with little echo
Ubertragungs-Charakteristika in einem Raum mit geringem Echo
Exemple de réponse de transmission dans une salle ayant
un peu d''écho
i§
ae
eon
0
Level
{dB) Pegel
(dB) Niveau
{dB)
Frequency
(Hz)
Frequenz (Hz}
Fréquence (Hz)
Example of cartridge response (The-dotted line (....) indicates
the frequencies after compensation.)
Tonabnehmer-Charakteristika
(Die gestrichelte
Linie zeigt die
Frequenz nach Klangregelung an.)
Exemple
de réponse d'une cellule de lecture (La ligne pointillée
indique Jes fréquence aprés la compensation.)
Level
(dB}
Pegel
(dB) Niveau
(dB)
Frequency (Hz)
Frequenz (Hz)
Fréquence
(Hz)
Example of speaker reproduction response (The dotted line (... .) indicates
the frequencies after compensation.)
Wiedergabe-Charakteristika eines Lautsprechers
(Die gestrichelte Linie zeigt
die Frequenz nach K langregelung an.}
Exemple
de réponse de reproduction G'une enceinte
(La ligne pointiliée
indique tes fréquences aprés !a compensation.)
= | ee
Compensation for room acoustics
The frequency
response of a listening room varies depending
on the mode of the room or on the position of the listener in
the room. Sound
response
inherent to the listening position
is therefore produced by a different degree of reverberation,
reflection, echo and absorption for each listening position in
each room.
The SEA system can function to make the sound response of a
room
flat by emphasizing
those frequencies
having a high
degree
of absorption
and de-emphasizing
those
frequencies
having a high degree of reflection.
The frequency ranges affected by 'absorption' and 'reflection'
are narrow, therefore it is necessary only to compensate the
corresponding frequency band.
Since
conventional
tone
control
systems
simply
adjust the
highs and
lows centered
around
the 1 kHz
frequency, they
influence other frequencies.
The SEA-60
system
has 10 separate audible frequency bands
and functions
to compensate
only the necessary frequency
range, so as to compensate for the acoustic response of each
listening position and room.
Compensation
for reproduction
responses of cartridges
and
speakers
Almost all moving-magnet cartridges have response curve peaks
between 10 kHz and 20 kHz.
The SEA graphic equalizer, with which minute adjustments at
each frequency band is possible, has enabled the flat reproduc-
tion of their responses compensated over the entire frequency
range.
The
SEA
graphic equalizer can
compensate
for attenuated
response below 100 Hz, peculiar to airtight speaker enclosures,
by adjusting the 63 Hz control. It can also compensate for an
obscure vocal by lowering the 4 kHz control and raising the
250 Hz and 1 kHz controls. Also for mid-and high-range horn
type speakers, the SEA
system can eliminate
harsh, grating
sounds by lowering the 4 kHz control.
Fine compensation
The
SEA
graphic
equalizer
having
response
curves
to
be
adjusted by +12 dB can compensate for relatively great varia-
tions in response, such as those in listening rooms and speaker
systems.
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