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Ashly FET-200 - Page 12

Ashly FET-200
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IMPEDANCE
Essentially
the
AC
equivalent
of
resistance.
It
describes
the
drive
capability
of
an
output,
or
the
amount
of
drive
required
for
an
input
at
any
given
signal
level.
KHz
Kilohertz.
1,000
Hertz.
LEVEL
The
magnitude
of
a
signal,
expressed
in
decxoels
or
volts.
LIMITER
An
amplifier
which
reduces
its
gain
as
its
input
is
increased
beyond
a
predetermined
threshold.
Usually
used
to
protect
audio
systems
against
sudden,
high
level
signals,
and
possible
overload.
LIJJE
LEVEL
i'leaning
somewhere
around
OdBV*
as
opposed
to
MIC
level
of
around
-40dBV.
MILLISECOND
1/lOOOtn
of
a
second
MICROSECOND
1/1,000,000th
of
a
second
OCTAVE
A
logarithmic
unit
to
compare
frequencies.
+1
Octave
means
double
frequency,
-1
Octave
means
half
frequency.
OHM
The
unit
of
electrical
resistance
or
impedance.
PHASE
Describes
how
well
two
signals
are
in
step.
In-phase
means
that
positive
and
negative
peaks
in
two
signals
occur
together,
while
out-of-phase
means
they
do
not
occur
together.
Variations
in
signal
timing
as
well
as
polarity
can
make
two
signals
in
or
out
of
phase,
or
anywhere
in
between.
Phase
is
usually
measured
in
degrees
where
0
degrees
is
in-phase,
180
degrees
is
out-of-phase,
and
90
degrees
is
in
between
(sometimes
called
quadrature).
PREAMPLIFIER
The
first
stage
of
amplification,
designed
to
boost
very
low
Level
signals
to
line
level.
"Q"
A
measurement
describing
the
sharpness
or
broadness
of
a
filter.
PvESONAt^CE
The
tendency
of
an
electrical
or
mechanical
system
to
vibrate
(or
oscillate)
at
a
certain
frequency.
SATURATION
The
point
at
which
the
magnetic
storage
capability
of
a
piece
of
recording
tape
is
exceeded.
11

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