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dbx 128 - SIMPLE PRECAUTIONS WHEN USING ANY PROGRAM EXPANDER

dbx 128
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SIMPLE
PRECAUTIONS
WHEN
USING
ANY
PROGRAM
EXPANDER
The
128
(or
any
expander)
places
greater
demands
on
your
power
amplifier
and
speakers.
Whether
or
not
a
given
amplifier
is
of
adequate
power
rating
is
not
always
easy
to
determine;
it
depends
partially
on
the
sensitivity
of
the
speakers,
and
partially
on
the
distortion
characteristics
of
the
amplifier.
With
most
bookshelf
speakers,
average
listening
levels
of
85
dB
SPL
can
be
achieved
with
1
watt
of
power
(per
chan-
nel).
Very
quiet
passages
of
55
dB
SPL
(30
dB
below
average)
would
require
only
1
milliwatt
(1/1000-watt)
from
the
amp-
lifier,
yet
very
loud
passages
of
105
dB
SPL
(20
dB
above
average)
would
require
100
watts
from
the
amplifier.
In
other
words,
to
produce
a
dynamic
range
of
50
dB,
the
amplifier
swings
between
1
milliwatt
and
100
watts.
High
sensitivity
studio
monitor
speakers
produce
about
98
dB
SPL
for
a
1
watt
input
(at
1
meter
distance
from
the
speaker).
With
a
300-watt
amplifier,
and
a
10
dB
allowance
for
peaks,
one
of
these
studio
monitors
can
produce
a
maximum
of
about
113
dB
SPL.
Set
for
1:1.5
expansion,
the
128
will
expand
a
good
60
dB
classical
recording
to
about
90
dB
of
dynamic
range.
Full
realization
of
the
benefit
of
this
dynamic
range
requires
both
a
hefty
power
amplifier
and
speakers
that
can
take
the
high
power.
If
you
have
such
equipment,
the
results
will
be
breath-
taking.
Fortunately,
such
components
are
not
mandatory
for
full
enjoyment
of
the
128.
The
most
important
point
is
this;
if
the
speakers
and
amplifier
cannot
handle
wide
dynamic
range,
and
if
the
ex-
pander
“‘tries”
to
drive
them
to
a
wide
dynamic
range,
excessive
clipping
distortion
(overdrive)
may
occur.
To
avoid
this
unpleasant
effect,
use
decent
speakers
and
a
reasonably
large
amplifier.
If
distortion
still
occurs,
it
will
probably
be
noticed
only
with
programs
that
have
a
good
dynamic
range
to
begin
with,
and
which
do
not
need
expansion
to
much
35
greater
dynamics.
In
such
cases,
a
reduction
in
the
expansion
ratio
setting
will
avoid
distortion.
A
good
expander
is
a
powerful
tool,
and,
as
with
any
powerful
tool,
it
can
be
used
to
excess.
Used
properly,
the
expander
can
turn
an
old
record
collection
into
a
treasure
of
new
listening
enjoyment,
and
it
can
turn
a
boring
selection
of
compressed
and
limited
FM
broadcasts
into
an
exciting
new
source
of
listening
pleasure.

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