Bose 901 Series II Owner's guide - Page 12

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The effect of the various control settings upon the frequency response (taking the normal or "dotted" posi. tion as "flat") is illustrated in Figures 9 and 10. (Clu•t.ZE• RESPONSE IN O(COIILS 4/L•TivE T0 To•T •ESONS( Of TRf EOLmutt erns. ALL SwiTcHts IN THEIS ' , 0"." POS, T.ONS 5 BELOW 40 0 SWITCH POSITION • 7. ____-•• Mr IRMA IAN(' SmTCH ITOS.I.0% -----\ 5 -., 4\ • 2 -----"j il Of Lex 40 CONTowi FREQUENCY RESPONSE CONTOUR OF THE 805E 901 SERIES ii ACTIVE COIJALIZER WITH THE HIGH FREOUENCV SWITCH IN THE NORMAL POSITION 20 I50 100 500 1,000 5.000 10.000 20K FIG. 9 ECIVALIZI• PERSONS( IN OttiOELS TO TRE RESPONSE oOrr THE ECvAL.ZE A A, T. ALL SW'TC"CS 'N EH( a NORMAL POSIT IONS 5 TR SIC LEVEL SRI rt. POSI NOV l 4111i tll D 4 1. FREQUENCY RESPONSE CONTOURS OF THE 805E 901 SERIES ii ACTIVE EOt/RuZER WITH THE miG. FREQUEWCY SWITCH IN THE DECREASE POSITION \-/ 20 50 100 500 1.000 5.000 I 10.000 N--- 20K FIG. 10 HIGH FREQUENCY The next frequency control of the 901 Equalizer is labeled HIGH FREQ. If the control is moved to the DECREASE position, the frequency response of the system is decreased in the high treble range above 10 kHz . This control may be used as a scratch filter, or to modify the response of some recordings which are excessively bright in the high treble range. TREBLE LEVEL The next frequency control is a rotary switch labeled TREBLE LEVEL. This control has 5 positions. The third position is the normal, or "dotted" position. The "dotted" position is the preferred position for use in rooms of average acoustical properties. In a room that is extremely "bright" due either to room conditions or to the recording you are playing, you 12

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The
effect
of
the
various
control
settings
upon
the
frequency
response
(taking
the
normal
or
"dotted"
posi.
tion
as
"flat")
is
illustrated
in
Figures
9
and
10.
IAN(‘
ITOS.I.0%
-----\
Mr
5
-.,
4\
•
2
-----"j
il
(Clu•t.ZE•
RESPONSE
4/L•TivE
T0
To•T
•ESONS(
Of
TRf
EOLmutt
erns.
ALL
SwiTcHts
IN
THEIS
',
0".“
POS
,
T.ONS
5
IN
O(COIILS
IRMA
SmTCH
BELOW
40
0
SWITCH
POSITION
•
7.
____—••
20
Of
Lex
40
CONTowi
I50
100
FREQUENCY
RESPONSE
ACTIVE
COIJALIZER
THE
NORMAL
POSITION
CONTOUR
WITH
THE
HIGH
500
OF
THE
805E
901
SERIES
ii
FREOUENCV
SWITCH
IN
1,000
5.000
10.000
20K
FIG.
9
ECIVALIZI•
PERSONS(
Or
TO
TRE
RESPONSE
or
THE
ECvAL.ZE
A
A
,
ALL
SW'TC"CS
'N
EH(
NORMAL
POSIT
IONS
IN
OttiOELS
T.
a
l
t
i
ll
5
TR
SRI
SIC
LEVEL
rt.
POSI
NOV
4111
.-.---
..........
\\\,
------...
\D
4.
„
\
\
:„..1.
20
50
100
FREQUENCY
RESPONSE
ACTIVE
EOt/RuZER
THE
DECREASE
POSITION
500
CONTOURS
WITH
THE
miG.
1.000
OF
THE
805E
901
SERIES
ii
FREQUEWCY
SWITCH
IN
5.000
10.000
\-/
I
N---
20K
FIG.
10
HIGH
FREQUENCY
The
next
frequency
control
of
the
901
Equalizer
is
labeled
HIGH
FREQ.
If
the
control
is
moved
to
the
DECREASE
position,
the
frequency
response
of
the
system
is
decreased
in
the
high
treble
range
above
10
kHz
.
This
control
may
be
used
as
a
scratch
filter,
or
to
modify
the
response
of
some
recordings
which
are
excessively
bright
in
the
high
treble
range.
TREBLE
LEVEL
The
next
frequency
control
is
a
rotary
switch
labeled
TREBLE
LEVEL.
This
control
has
5
positions.
The
third
position
is
the
normal,
or
"dotted"
position.
The
"dotted"
position
is
the
preferred
position
for
use
in
rooms
of
average
acoustical
properties.
In
a
room
that
is
extremely
"bright"
due
either
to
room
conditions
or
to
the
recording
you
are
playing,
you
12