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Bose 901 IV Series

Bose 901 IV Series
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r
V.
Living
with
your
BOSE
901
Loudspeakers
The
eflecf
of
lisieoing
room
acoustics
rs
to
radtcalty
modify
the
looai
balance
of
any
loudspeaker
This
effect
can
be
greater
than
the
difference
between
two
loudspeakers
of
substantially
different
cost.
As
part
of
Its
ongoing
research
in
sound
reproduction.
60SE
Corporation
has
carried
out
an
extensive
program
examining
the
acoustic
properties
of
a
wide
range
of
listening
rooms.
The
development
of
the
901
Series
IV
loudspeaker
is
an
Important
result
of
this
research
and
development
The
90i
Series
iV
loudspeaker
system
solves
the
problem
of
the
effect
of
the
room
on
speaker
performance
with
a
new
eoualizer
design
that
provides
controls
specifically
designed
to
compen¬
sate
for
the
effects
of
room
characteristics,
musical
sources,
and
speaker
placement.
A
contribution
in
achieving
this
new
performance
is
the
riew
driver
used
with
the
90i
Series
IV.
This
new
driver
assembly
has
an
improved
efficiency
in
the
range
of
10*15
kHz.
Improvements
in
components,
adhesives,
and
manufacturing
techniques
have
also
made
possible
further
improvements
in
the
high-power
handling
capability
of
the
driver.
The
power
handling
capability
of
the
speaker
system
has
been
improved
to
the
point
that
there
are
no
restrictions
on
the
size
of
the
amplifier
used
with
the
901
Series
IV
in
non-convnerciai
ap-
pilcalions,
providing
the
fusing
recommendations
Irt
this
owner's
manual
are
followed.
The
combination
of
new
equalizer
controls,
improvernenis
m
high-lrequency
efficiency,
and
high-power
handling
capabili¬
ties
make
the
901
Series
iV
speaker
system
unusually
flexible
with
respect
to
location
in
the
listening
room,
room
acoustics,
and
choice
of
power
amplifier,
A.
SOURCE
AND
ROOM
COMPENSATION
CONTROLS
The
901
Series
IV
Active
Equalizer
Controls
have
been
design¬
ed
from
a
radically
different
vantage
point.
Currently
available
tone
controis
iound
on
amplifiers
and
receivers
feature
bass
and
treble
controls
that
are
primarily
designed
around
estab¬
lished
circuits.
These
circuits
were
designed
without
any
specific
compensation
requirement
and
therefore
cannot
compensate
for
the
speoric
effects
of
room
acoustics,
For
example,
most
current
bass
controls
not
only
adjust
the
micl*bass
normally
affected
by
room
acoustics,
but
also
the
deep
bass
ar^
fo^r
midrange.
Also,
adjusting
the
treble
con¬
trol.
will
adjust
the
extreme
highs
out
of
proportion
to
the
upper
treble
end
rrudrange.
The
new
901
Series
IV
equaiizsr
addresses
this
dilemma
with
two
new
controls
called
Source
arid
Room
Compensation
Controls.
Certain
portions
of
the
midbass
of
any
speaker
system
win
tend
fo
vary
dramatically
as
a
function
of
listening
room
acoustics.
60SE
has
addressed
this
problem
with
the
LOW
FREQUENCY
CONTROL
that
provides
up
to
16
d6
of
change
in
the
100
to
400
Hz
range.
This
frequency
contouring
circuit
is
designed
1o
provide
the
compensation
required
to
match
the
acoustics
of
your
listening
room.
The
HIGH
FREQUENCY
CONTROL
is
a
shelving
function
that
begins
affecting
the
sound
at
1
kHz
and
can
significantly
ad-
just
the
speaker's
presence
and
sonic
detail
over
the
midrange
and
high-frequency
range
without
sacrificing
perfor¬
mance
at
the
extreme
high
frequencies.
Regardless
of
the
acoustics
of
your
listening
room,
this
control
allows
the
speaker
system
to
achieve
the
correct
spectral
balance.

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