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Fisher EQ-274 - General Information; Technical Description

Fisher EQ-274
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General
Information
This
manual
is
designed
to
provide
all
necessary
information
and
instructions
for
successful
operation
of
your
FISHER
Graphic
Equalizer.
!f
you
are
installing
the
unit
yourself,
please
pay
careful
attention
to
the
section
on
connecting
the
Graphic
Equalizer
to
other
units
in
your
sound
system.
Com-
plete
information
is
given
on
the
following
pages.
This
unit
has
been
adjusted
for
operation
on
220
volts,
50Hz,
AC.
If
the
voltage
in
your
area
is
different
to
this
voltage,
please
pay
careful
attention
to
point
number
3
of
this
manual:
“Connections
on
the
Rear
Panel.”
Your
FISHER
Graphic
Equalizer
is
designed
to
be
insensitive
to
temperature
and
voltage
changes
under
normal
conditions.
For
longer
service
life
and
operating
safety,
the
unit
should
not
be
placed
near
sources
of
extreme
heat
.
(close
to
heating
units
or
radiators),
direct
sunlight
or
areas
of
high
humidity
or
moisture.
Voltage
fluctuations
greater
than
+10%
can
lead
to
mechanical
failure
of
the
unit.
lf
you
have
questions
on
these
points,
please
ask
your
dealer
for
further
information.
To
set
up
your
Graphic
Equalizer
for
operation,
a
series
of
connections
to
the
usual
components
such
as
preamplifier,
power
amplifier,
cassette
recorder,
must
be
made,
in
accor-
dance
with
the
chosen
connection
method.
The
last
connec-
tion
which
should
be
made
in
the
series
is
with
the
mains.
Follow
the
connection
and
operation
instructions
carefully
in
a
step-by-step
manner
and
within
a
short
time,
you
will
have
gained
all
knowledge
needed
for
successful
operation
of
your
FISHER
Graphic
Equalizer.
Before
you
switch
on
your
unit
for
the
first
time,
please
check
that
all
connections
and
installation
requirements
have
been
completed.
The
volume
control
on
the
connected
amplifier
should
be
set
to
the
minimum
position.
Technical
Description
General
The
FISHER
Graphic
Equalizer
EQ-274
is
designed
for
the
combination
with
the
FISHER
System
274W.
Use
of
a
Graphic
Equalizer
The
term
“Graphic
Equalizer”
has
established
itself
in
semi-
professional
audio
engineering.
It
is
a
preamplifier
component
which
exclusively
influences
the
frequency
response
of
the
traversing
signals.
Such
units
bring
about
considerable
changes
in
sound
quali-
ty
and
correct
any
colourations
(linear
distortions).
Even
acoustic
deficiencies
in
reproduction
and
short-comings
of
the
loudspeakers
in
use
can
be
compensated
by
the
Graphic
Equalizer.
The
FISHER
EQ-274
is
constructed
in
such
a
way
that
it
can
be
used
in
different
ways
with
other
units
from
the
FISHER-
series.
The
overail
gain
of
the
EQ-274
is
zero
i.e.
input
and
output
voltage
is
the
same
when
the
tone
controls
are
in
the
middle
position.
Input
and
output
voltage
and
impedances
are
chosen
in
such
a
way
that
the
unit
can
easily
be
combined
with
most
Hi-Fi
components
of
other
manufacturers
on
the
market.
The
precondition
is
tape
recorder
connections
which
conform
to
the
international
norm
(Cinch,
RCA).
Combining
with
other
Hi-Fi
components
The
connection
method
of
the
EQ-274
depends
on
the
quali-
ties
of
the
connected
amplifier
and
the
functions
nich
the
Equalizer
is
meant
to
take
over.
The
possibilities
are:
—
1.
Connecting
the
EQ-274
between
the
preamplifier
and
the
power
amplifier.
a)
With
separate
units
(preamplifier
and
power
amplifier):
the
sound
signal
from
the
preamplifier.
reaches
the
Equalizer
and
is
ready
at
the
LINE
OUT
cables
for
connection
with
the
power
amplifier.
b)
With
integrated
pre-/power
amplifiers
with
separable.
connection
between
the
pre-
and
power
amplifier
(e.g.
FISHER
CA-275
or
CA-276):
pull
out
the
link
plug
at
the
back
of
the
amplifier,
connection
as
under
point
1a.
(Fig.
1)
The
connection
method
described
here
is
useful
if
the
Equalizer
EQ-274
is
only
meant
to
influence
the
repro-
duction
frequency
response,
room
acoustics,
and
loud-
speaker
qualities.
Advantages
of
this
connection
method:
Easy
to
understand,
to
connect
and
to
use;
all
possibili-
ties
of
tape
recorder
reproduction
and
copying
with
tape
monitoring
are
retained.
Disadvantages
of
this
connection
method:
Due
to
lack
of
connecting
jacks
not
practicable
with
alt
units.
Equalization
of
tape
recordings
is
not
possible.
2.
Connection
of
the
EQ-274
to
the
tape
recording
and
reproduction
jacks
of
the
tape
recorder.
(Set
the
tape
monitor
on
the
amplifier
to
TAPE
or
PLAY.)
The
sound
signal
from
the
jacks
TAPE
REC
reaches
the
Equalizer
via
the
cables
LINE
IN,
traverses
the
Equalizer
and
arrives
at
the
cables
LINE
OUT
ready
to
be
fed
into
the
jacks
TAPE
PB
of
the
amplifier.
Cassette
recorders
and
tape
recorders
can
be
connected
to
the
jacks
TAPE
of
the
Equalizer.
(Fig.
2)
Advantages
of
this
connection
method:
Tape
recordings
(including
tape
monitoring)
can
be
made
with
or
without
equalizer.
Disadvantages
of
this
connection
method:
Due
to
a
complex
signal
path,
misuse
of
the
system
is
possible.
Tape
recordings
are
sometimes
produced
in-
correctly
without
linear
frequency
response,
and
over-
loading
of
the
cassette
recorder
during
recording
is
possible.
The
possibility
of
tape
copying
is
limited
ac-
cording
to
the
circuit
and
connection
technique
of
the
amplifier.
By-Pass
(Only
connection
method
2:)
Independent
of
the
condition
of
the
Equalizer
and
the
current
position
of
the
20
slide
potentiometers,
the
Equalizer
can
be
electrically
totally
by-passed
and
thereby
switched
over
to
strictly
linear
frequency
and
phase-linear
characteristics,
:

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