dbx 165 Manual de instrucciones - Página 2
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Dear dbx customer:
Your new model 165A is identical
to the old model 165 except
for a
special
feature
called
Pea
kStop.
Until
a new manual
is produced,
.
this
memo
has all
of the necessary
PeakStop
information
and is intended
to
supplement
the accompanying
165
manual.
The PeakStop
feature
allows
you to control
t
he
maximum peak levels
at
the output
of the 165A irrespective
of any other
control
.
PeakStop
comes
after
the
co mpression
and other
circuitry,
including
the
output
gain,
so
it
lets
an absolute
limit
be
put
on the peak-to-peak
excursions
of the
output.
PeakStop
works instantaneously;
you are able
to apply moderate
amounts
of dbx's
Over
Easy
compression
and will
still
be protected
from
large
transients,
nther
short-term
ov
er
loads,
and overmodulation.
Technically,
PeakStop
consists
of a sophisticated
voltage-controlled
clipper
that
produces
a minimum of audible
distortion.
It
rounds
the
corners
of a
peak
rather
than
cutting
it
off
sharply,
as
the word
"clipping"
usually
implies.
By making a signal's
leading
and trailin
g
.
e dges
curved
instead
of
sharp
corners,
it
reduces
the amount of higher
odd-order,
offensive-sounding
harmonics
that
conventional
clipping
causes.
The level
at which PeakStop
is activated
is adjustable
from
-2
to
+24
dBm.
Note that
small
signal
excursions
above the set value
of
PeakStop
are
possible,
to allow
the rounding
to take place;
therefore,
for
any applications
where you must not exceed
a given
ceiling,
set
the
PeakStop
control
1-2
dB below.it
to
be sure
.
The
red
PeakStop
LED
flashes
whenever
peaks attempt
to exceed
PeakStop
level
and get
reduced
in amplitude.
To disable
the PeakStop
function
altogether,
simply
set
the control
to
+24
dBm
(which
is the maximum output
level
of the
165A
anyway).
In use,
the PeakStop
function
can
prevent
an amplifier
from being
driven
into
hard
clipping,
where it
can
lose
control
over
the speaker
system.
PeakStop
is a smooth,
well-controlled
clipper
whose behavior
is
sonically
similar
to the gentleness
of Over Easy compression;
its
clipping
is
much
preferable
to
a
power amp's.
As mentioned,
control
of speaker
overexcursion,
broadcast
overmodulation,
and harsh
electronics
clipping
are all
applications
of PeakStop.
With it
and Over Easy,
you have the
best
of both worlds:
virtually
inaudible
rms compression
and peak
protection
downstream
at the end.
Sincerely,
dbx Inc.
Professional
Products
dbx. Inco rpor
at
ed/
71
Chapel
Street
/ Box 100C
I
Newton, Massachusetts 02195 /
T
el.
(617).
964-3210 /Telex 92-2522