Bose 501 Series II Owner's guide - Page 6

Maintenance

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Crossover Network The crossover network exactly matches the frequency response of the woofer and tweeters throughout the audio range. • The crossover network effectively extends the high-frequency response of the tweeters. This network consists of two high-grade film capacitors, two 5% resistors, and an inductor. Computer style wire-wrap connections are used throughout the crossover network for maximum reliability. Power Handling Capability Recommended Amplifier Power is as follows: 1. Minimum rms power at 4 ohms - 20 watts 2. Maximum rms power at 4 ohms - 100 watts' 'For reproducing speech and music, amplifiers exceeding 100 watts may be used if fusing recommendations are followed. (Check Section III B 3.) Most 501 owners will find amplifiers rated between 35 and 50 watts rms per channel most satisfactory. In fact, very loud volume is possible with amplifiers rated at 50 watts rms per channel. For source material with wide dynamic range, and extremely loud volume, amplifiers rated over 70 watts rms per channel may be used. Impedance Rating of the BOSE 501 The impedance of the 501 speaker system Is 4 ohms. However, impedance ratings for high fidelity loudspeakers are not based on universally recognized standards. Bose Corporation chooses a very conservative method for rating impedance. The actual impedance of the 501 loudspeaker system over the audio frequency range is shown below. As can be seen from the curve the impedance is always greater than 4 ohms, and over most of the audio range is over 8 ohms. Loudspeakers with average impedance lower than that of the 501 have been rated by their manufacturers as having a nominal impedance of 8 ohms, indicating that their loudspeakers are suitable for use In multiple speaker Installations. With high quality receivers the impedance of the 501 is high enough to permit operating two 5015 in parallel. 64 8O5E 501 RATED IMPEDANCE 4 OHMS 32 16 8 IMPEDANCE IN OHMS 2 20 40 100 200 400 1000 2000 4000 FREQUENCY IN Hz VI. CARE AND MAINTENANCE 10.000 20.000 The 501 has a walnut vinyl veneer cabinet with a dark brown! random-black, textured grille cloth. The vinyl veneer may be cleaned by wiping with a soft cloth wetted with water and detergent, or soap. The grille cloth requires no care, although it may be carefully vacuumed if necessary. The loudspeaker and crossover elements of the 501 are designed for long, maintenance-free life. Used properly, the 501 should provide you with many years of enjoyment. 6

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IMPEDANCE
IN
OHMS
64
32
16
8
2
Crossover
Network
The
crossover
network
exactly
matches
the
frequency
response
of
the
woofer
and
tweeters
throughout
the
audio
range.
The
crossover
network
effectively
extends
the
high
-frequency
response
of
the
tweeters.
This
network
consists
of
two
high-grade
film
capacitors,
two
5%
resistors,
and
an
inductor.
Computer
style
wire
-wrap
connections
are
used
throughout
the
crossover
network
for
maximum
reliability.
Power
Handling
Capability
Recommended
Amplifier
Power
is
as
follows:
1.
Minimum
rms
power
at
4
ohms
—
20
watts
2.
Maximum
rms
power
at
4
ohms
—
100
watts'
'For
reproducing
speech
and
music,
amplifiers
exceeding
100
watts
may
be
used
if
fusing
recommendations
are
followed.
(Check
Section
III
B
3.)
Most
501
owners
will
find
amplifiers
rated
between
35
and
50
watts
rms
per
channel
most
satisfactory.
In
fact,
very
loud
volume
is
possible
with
amplifiers
rated
at
50
watts
rms
per
channel.
For
source
material
with
wide
dynamic
range,
and
extremely
loud
volume,
amplifiers
rated
over
70
watts
rms
per
channel
may
be
used.
Impedance
Rating
of
the
BOSE
501
The
impedance
of
the
501
speaker
system
Is
4
ohms.
However,
impedance
ratings
for
high
fidelity
loudspeakers
are
not
based
on
universally
recognized
standards.
Bose
Corporation
chooses
a
very
conservative
method
for
rating
impedance.
The
actual
impedance
of
the
501
loudspeaker
system
over
the
audio
frequency
range
is
shown
below.
As
can
be
seen
from
the
curve
the
impedance
is
always
greater
than
4
ohms,
and
over
most
of
the
audio
range
is
over
8
ohms.
Loudspeakers
with
average
impedance
lower
than
that
of
the
501
have
been
rated
by
their
manufacturers
as
having
a
nominal
impedance
of
8
ohms,
indicating
that
their
loudspeakers
are
suitable
for
use
In
multiple
speaker
Installations.
With
high
quality
receivers
the
impedance
of
the
501
is
high
enough
to
permit
operating
two
5015
in
parallel.
8O5E
501
RATED
IMPEDANCE
4
OHMS
•
20
40
100
200
400
1000
FREQUENCY
IN
Hz
VI.
CARE
AND
MAINTENANCE
2000
4000
10.000
20.000
The
501
has
a
walnut
vinyl
veneer
cabinet
with
a
dark
brown!
random
-black,
textured
grille
cloth.
The
vinyl
veneer
may
be
cleaned
by
wiping
with
a
soft
cloth
wetted
with
water
and
detergent,
or
soap.
The
grille
cloth
requires
no
care,
although
it
may
be
carefully
vacuumed
if
necessary.
The
loudspeaker
and
crossover
elements
of
the
501
are
designed
for
long,
maintenance
-free
life.
Used
properly,
the
501
should
provide
you
with
many
years
of
enjoyment.
6