Symetrix SE-400 User manual
MODEL
SE-400
STEREO
PARAMETRIC
EQUALIZER
OPERATIH6
MANUAL
Revision
1.0
22
SepteMber,
1986
SyMetri
x,
Inc.
4211
24th
Ave
West
Seattle,
WA
98199
Telephone
(206
)
282-2555
Telex
703282
SYMETRIX
UO
Copyright
1986 Sy
Metri
x ,
Inc.
--
Page
1.
SE-400
Stereo
Parametric
Equalizer
Instructioh
Manual
GENERAL
DESCRIPTION
The
SE-400
is
a
stereo
(two
channel)
parametric
equalizer.
Each
channel
has
four
inde?endent
frequency
11
bands
11
•
The
circuitry
and
functions
of
the
four
bands
are
all
similar,
but
not
identical.
This
will
be
explained
in
detail
below.
Each
band
has
the
following
controls:
variable
freauencv,
variable
band
w
idth,
and
variable
arnolitude.
Additional
controls
for
each
channel
include
the
Inout
Level
control,
Parametric
EQ
in/out
switch,
th~
Subsonic
Filter
in
/
out
switch.
A
master
Power
On
/
Off
s·t1itch
is
.
found
on
the
right
hand
side
of
the
front
paneI-:-
Visual
indicators
on
the
SE-400
include
a
green
LED
(light
emitting
diode)
associated
with
the
?arametric
EQ
in/out
switch,
a
vellow
LED
associated
with
the
sub-son{c
filter
switch,
an~
a
red
+18dBrn
peak
level
indicator
. .
~
FREQUENCY
BANDS
As
mentioned
above,
each
channel
of
the
SE-400
has
four
frequency
bands.
The
bands
are
labeled
individually
below
each
group
of
three
(vertical)
knobs.
The
four
bands
are:
LOW,
LO~-MID,
HIGH-MID,
and
HIGH. As
previously
men-
tioned
the
three
controls
in
each
band
are
frequency,
band-
width,
and
amplitude.
Color
coded
knob
caps
are
used
on
.
·
the
SE-400
to
simpli~y
identificatiqn
of
function.
All
frequency
control
knobs
are
blue,
bandwidth
control
knobs
are
black,
and
amplitude
control
knobs
are
green.
Let's
begin
our
discussion
of
the
knob
functions
with
the
frequency
control
knob.
This
knob
allows
the
user
to
vary
the
frequency
of
equulization
across
a
certain
spectrum
of
the
audio
frequency
bund
.
(usually
considered
to
be
20
HZ
to
20
,OOO!IZ ) •
With
this
knob
we
are
able
to
choose
the
exact
frequency
at
which
we
will
boost
(increase)
o~
cut
(decrease)
the
c1mplitudc
(volume
level)
in
the
particular
band
we
are
adjusting.
Th~
frequericy
controls
1or
all
the
109 Dell
Street,
Soattlc,
Vla.
98121 U.S.A. (206) 62"1-5012
Page_2.
SE-400
Instruction
Manual
continued
bands
are
calibrated
in
.
Hertz
(HZ)
which
is
simply
another
name
for
cycles
per
second.
If
we
take
the
low
band
for.
example
we
can
see
that
the
available
range
of
frequencies
with
which
we
can
deal
with
varies
from
16
HZ
to
512
HZ.
Likewise,
the
high
band
frequencies
ace
variable
from
686
HZ
up
to
22K
HZ
(22,000
cycles
per
second).
r, h
I' 4
••
Let
us
now
move
on
to
the
discussion
of
the
lower
of
the
three
knobs
on
each
band,
the
Amolitude
control
knob.
All
the
amplitude
control
knobs,
as
9reviously
mentioned
are
green.
The
a~plitude
controls
on
the
SE-400
are
calibrated
in
dB
(decibels).
Each
amplitude
control
is
capable
of
boosting
or
cutting
signals
at
the
chosen
frequency
in
it's
band
by
16
dB.
When
the
pointer
on
ths
color
cap
is
pointing
straight
up,
we
are
at
the
"zero"
dB
position,
or
in
other
words
our
band
is
essentially
out
of
the
circuit.
When
the
amplitude
control
is
turned
fully
clockwise
we
are
boosting
the
cihosen
frequency
in
that
band
by
16
dB.
When
the
control
is
fully
counter-clockwise,
we
are
cutting
(decreasing)
by
.
16
dB.
The
third
control
on
each
frequency
band
is
the
Bandwidth
control.
This
~ontrol
uses
a
black
color
cap
(if
you
can
call
black
a
color!).
The
bandwidth
control
is
calibrated
in
octaves,
and
is
variable
from
.16
to
3.3
(a
sixth
of
an
octave
to
three
and
one-third
octaves).
Remember,
an
octave
represents
a
doubling
in
frequency
of
a
musical
note
(or
a
halving
in
frequency
going
downward).
What
the
bandwidth
control
actu~lly
does
is
to
allow
us
to
choose
how
wide
a
range
of
frequencies,
centered
around
the
frequency
selected
by
the
positioning
of
the
blue
frequency
select
control,
that
we
are
going
to
effect
when
we
adjust
the
green
amplitude
control.
To
clear
this
all
up,
let's
look
at
a
practical
exumple.
Assume
we
have
made
a
tape
recording
and
somehow
there
is
a
low
freauencv
hum
on
the
tape
which
we
wish
to
eliminat~.
Assumi~g
th~t
the
t~pe
sounds
fine
except
for
the
hum
then
our
onlv
task
is
to
eliminate
t~e
hum
a~d
Dnly
the
hum.
First
w~
would
go
to
the
low
band
~nd
turn
the
amplitude
control
to
some
point
109
Bell
Street,
Seattle,
Vla. 98121 U.S.A.
(206)
62'1-5012
Page
3.
SE-400
Instruction
Manual
continued
to
the
left
of
center
to
cause
a
decrease
.
of
volume
in
that
band.
Next,
we
would
turn
the
frequency
control
and
"tune
in"
on
the
problem
f~eauencv.
Finallv,
the
bandwidth
co~trol
would
be
adjusted
to
some
point
where
the
hum
is
made
inaudible,
but
the
other
musicul
information
is
not
affected.
This
setting
would
probably
be
towards
the
far
counterclockwise
setting
of
the
control.
In
general
(but
not
always)
narrow
bandwidth
settings
(counter-clock-
wise
positioning3)
will
·
produce
less
audible
effects
thin
wide
bandwidth
settings.
The
Input
Level
Control
The
input
level
control
for
each
channel
of
the
SE-400
is
found
just
to
the
right
of
the
high
band
arr.plitude
control.
The
color
coding
cap
used
is
light
grey.
The
control
is
calibrated
in
dB.
The
purpose
of
the
input
level
control
is
two
fold:
1)
the
control
can
be
used
to
raise
the
level
of
inco~ing
signals
to
the
equalizer
by
up
to
lOdB
if
these
signals
are
weak
or
lower
than
standard
"line
level";
2)
the
control
can
also
be
used
to
decrease
the
signal
level
coming
into
the
equalizer
by
up
to
20dB.
This
should
be
done
when
one
is
either
dealing
with
very
large
level
incoming
signals
or
wh~n
the
equalizer
is
being
used
to
boost
one
or
~ore
frequency
bands
by
signifi-
cant
amounts.
In
this
case
the
input
level
control
should
be
decreased
(turned
counter-clockwise)
so
-
that
neither
the
output
stage
of
the
SE-400
nor
the
input
stage
of
the
follow-
ing
equipment
is
overloaded
so
as
to
cause
distortion.
The
Peak
Level
Indicator
An
excellent
feature
of
the
SE-400
which
aids
the
user
in
adjusting
the
input
level
control
to
the
correct
or
opti-
mum
positio~
is
a
red
LED
labeled
+18
dBm
PAak.
When
~he
output
level
of
the
SE-400
equals
~exceeds
+18d8m
this
LED
will
flash.
+18
dBm
is
JdB
lo"wer thcJ.n
the
SE-400's
clip
point.
Thus,
the
user
is
warned
in
advance
of
a
posibblc
distortion
condition.
By
turning
the
input
level
control
downward
until
the
LED
stops
flashing
the
109
Bell
Street,
Scattle,_Vla.98121.U.S.A.
(206)
624-5012
1
SE-400
Instruction
:·
!.~nual
continued
·
proper
setting
of
the
input
control
will
be
reached.
The
Subsonic
Filter
Page
4.
The
subsonic
filter
switch
which
is
positioned
on
each
channel
directly
above
the
input
level
concrol
has
a
yellow
LED
which
lights
when
the
filter
is
engaged
in
the
-
circuit.
The
subsonic
filter
is
actually
a
"hish-pass"
filter.
This
means
that
it
cuts
Out
low
freauencies
and
only
passes
high
frequencies
above
a
certain
-cut-off
frequency.
In
the
SE-400
the
cut-off
frequency
is
fixed
at
35
HZ,
with
a
roll-off
of
18dB
per
octave.
This
means
that
wh~n
-
the
sub-sonic
filter
is
switch~d
in
the
level
of
a
tone
with
frequency
of
17.5
HZ
is
lBdB
below
that
of
a
tone
at
35HZ.
More
simply,
when
engaged
the
sub-sonic
filter
removes
all
super
·
low
tones,
rumble,
ar,d
low
frequency
vibrations.
The
subsonic
filter
switches
in
and
out
of
the
signal
path
totally
independently
of
the
parametric
EQ
switch.
The
Parametric
EQ
in/out
switch
The
par~metric
EQ
in/out
switch
is
located
on
each
channel
directly
obove
the
sub-sonic
filter
switch.
As
you
may
have
already
guessed,
this
switch
is
the
master
switch
to
·
ehgage
or
disengage
the
four
parametric
bands.
When
the
.
switch
is
pressed
in~ard
a
green
LED
lights,
indicating
the
parametric
is
in
the
circuit.
Input
and
Out~ut
Connections
The
input
and
output
connectors
located
on
the
rear
panel
of
the
SE-400
ore
clea~ly
l2bell~d
for
both
channels.
Connections
should
be
made
by
.
using
standard
\"
phone
plugs
('tip-sleeve
: t'.t?.
~i-.
1
109 Boll
Street,
Seattle,
Vta.98121
U.S
...\.
(206)
62'1-5012
Page
S.
SE-400
Instruction
~anual
continued
Customer
Service
and
Acnlications
Assistance
If
you
have
questions
regarding
applications
or
if
you
need
assistance
in
learning
how
to
use
the
SE-400
please
consult
your
Symetrix
dealer
first.
If
you
need
a~ditional
information
or
if
you
have
a
defective
unit,
then
call
or
write
our
factory
directly
(
sorry,
we
do
not
accept
collect
6alls).
He
pride
ourselves
in
friendly,
efficient
customer
service.
Normal
ttturn-around
ti~e''
is
one
working
day.
You
must
pre-pay
freight
to
the
factory.
UPS
is
preferred.
We
pre-pay
the
return
freight.
ln
any
case,
please
call
first
for
RETURN
AUTHORIZATION.
109 Dell
Stroct,
Seattle,
Vla. 9Dl21
U.S
...\. (206) 621-5012
SE-400
Stereo
Parametric
Equalizer
Instruction
Manual
GENERAL
DESCRIPTION
Page
1.
The
SE-400
is
a
stereo
(two
channel)
parametric
equalizer.
Each
channel
has
four
independent
fr~quency
"bands".
The
circuitry
and
functions
of
the
four
bands
are
all
similar,
but
not
identical.
This
will
be
explained
in
detail
below.
Each
band
has
the
following
controls:
variable
freauencv,
variable
bandwidth,
and
variable
amolitude.
Additional
controls
for
each
channel
include
the
Inout
Level
control,
Parametric
EQ
in/out
switch,
th~
Subsonic
Filter
in/out
switch.
l\
master
Power
Or./Off
switch
is
.
found
on
the
right
hand
side
of
the
front
paner=-
Visual
indicators
on
the
SE-400
include
a
green
LED
(light
emitting
diode)
associated
with
the
Parametric
EQ
in/out
switch,
a
yellow
LED
associated
with
the
sub-sonic
filter
switch,
and
a
red
+18dBm
peak
level
indicator.
THE
FREQUENCY
BANDS
As
mentioned
above,
each
channel
of
the
SE-400
has
four
frequency
bands.
The
bands
are
labeled
individually
below
each
group
of
three
(vertical)
knobs.
The
four
bands
are:
LOW,
LOW-MID,
HIGH-MID,
and
HIGH.
As
previously
men-
tioned
the
three
controls
in
each
band
are
frequency,
band-
width,
and
amplitude.
Color
coded
knob
caps
are
used
on.
·
the
SE-400
to
simpli:y
identification
of
function.
All
frequency
control
knobs
are
blue,
bandwidth
control
knobs
are
black,
and
amplitude
control
knobs
are
green.
Let's
begin
our
discussion
of
the
knob
functions
with
the
frequency
control
knob.
This
knob
allows
the
user
to
vary
the
frequency
of
equalization
across
a
certain
spectrum
of
the
audio
frequency
band
.
(usually
considered
to
be
20
HZ
to
20
,OOO!IZ ) •
With
this
knob
we
are
able
to
choose
the
exact
frequency
at
which
we
will
boost
(increase)
or
cut
(decrease)
the
amplitude
(volume
level)
in
the
particular
band
we
are
adjusting.
Th?
frequency
controls
~or
all
the
109
Dell
Street,
Soattlo,
'\V'a.
98121 U.S.A.
(206)
62.tl-5012
Page
2.
S
,~r]
·
~r-1·1
J,'
11
u,
11-w
L •
SE-400
Instruction
Manual
continued
bands
are
calibrated
in
Hertz
(HZ)
which
is
simply
another
name
for
cycles
per
second.
If
we
take
the
low
band
for
example
we
can
see
that
the
available
range
of
frequencies
with
which
we
can
deal
with
varies
from
16
HZ
to
512
HZ.
Likewise,
the
high
band
frequencies
are
variable
from
686
HZ
up
to
22K
HZ
(22,000
cycles
per
second).
r, h
Let
us
now
move
on
to
the
discussion
of
the
lower
of
the
three
knobs
on
each
band,
the
Amolitude
control
knob.
All
the
amplitude
control
knobs,
as
previously
mentioned
are
green.
The
amplitude
controls
on
the
SE-400
are
calibrated
in
dB
(decibels).
Each
amplitude
control
is
capable
of
boosting
or
cutting
signals
at
the
chosen
frequency
in
it's
band
by
16
dB.
When
the
pointer
on
th~
color
cap
is
pointing
straight
up,
we
are
at
the
"zero"
dB
position,
or
in
other
words
our
band
is
essentially
out
of
the
circuit.
When
the
amplitude
control
is
turned
fully
clockwise
we
are
boosting
the
chosen
frequency
in
that
band
by
16
dB.
When
the
control
is
fully
counter-clockwise,
we
are
cutting
(decreasing)
by
16
dB.
The
third
control
on
each
frequency
band
is
the
Bandwidth
control.
This
control
uses
a
black
color
cap
(if
you
can
call
black
a
color!).
The
bandwidth
control
is
calibrated
in
octaves,
and
is
variable
from
.16
to
3.3
(a
sixth
of
an
octave
to
three
and
one-thirn
octaves).
Remember,
an
octave
represents
a
doubling
in
frequency
of
a
musical
note
(or
a
halving
in
frequency
going
downward).
What
the
bandwidth
control
actually
does
is
to
allow
us
to
choose
how
wide
a
range
of
frequencies,
centered
around
the
frequency
selected
by
the
positioning
of
the
blue
frequency
select
control,
that
we
are
going
to
effect
when
we
adjust
the
green
amplitude
control.
To
clear
this
all
up,
let's
look
at
a
practical
example.
Assume
we
have
made
a
tape
recording
and
somehow
there
is
a
low
frequency
hum
on
the
tape
which
we
wish
to
eliminate.
Assuming
that
the
t~~e
sounds
fine
except
for
the
hum
then
our
only
task
is
to
eliminate
the
hum
and
only
the
hum.
First
we
would
go
to
the
low
band
and
turn
the
amplitude
control
to
some
point
109
Bell
Street,
Seattle,
Via.
90121
U.S.A.
(206)
621-5012
•
•
Page
3.
SE-400
Instruction
Manual
continued
to
the
left
of
center
to
cause
a
decrease
of
volume
in
that
band.
Next,
we
would
turn
the
frequency
control
and
"tune
in"
on
the
problem
frequency.
Final
1
y,
the
bandwidth
control
would
be
adjusted
to
some
point
where
the
hum
is
made
inaudible,
but
the
other
musicul
information
is
not
affected.
This
setting
would
probably
be
towards
the
far
counterclockwise
setting
of
the
control.
In
general
(but
not
always)
narrow
bandwidth
settings
(counter-clock-
wise
positionings)
will
produce
less
audible
effects
than
wide
bandwidth
settings.
The
Input
Level
Control
The
input
level
control
for
each
channel
of
the
SE-400
is
found
just
to
the
right
of
the
high
band
amplitude
control.
The
color
coding
cap
used
is
light
grey.
The
control
is
calibrated
in
dB.
The
purpose
of
the
input
level
control
is
twofold:
1)
the
control
can
be
used
to
raise
the
level
of
incoming
signals
to
the
equalizer
by
up
to
lOdB
if
these
signals
are
weak
or
lower
than
standard
"line
level";
2)
the
control
can
also
be
used
to
decrease
the
signal
level
coming
into
the
equalizer
by
up
to
20dB.
This
should
be
done
when
one
is
either
dealing
with
very
large
level
incoming
signals
or
when
the
equalizer
is
being
used
to
boost
one
or
more
frequency
bands
by
signifi-
cant
amounts.
In
this
case
the
input
level
control
should
be
decreased
(turned
counter-clockwise)
so
that
neither
the
output
stage
of
the
SE-400
nor
the
input
stage
of
the
follow-
ing
equipment
is
overloaded
so
as
to
cause
distortion.
The
Peak
Level
Indicator
An
excellent
feature
of
the
SE-400
which
aids
the
user
in
adjusting
the
input
level
control
to
the
correct
or
opti-
mum
position
is
a
red
LED
labeled
+18
dBm
Peak.
When
the
output
level
of
the
SE-400
equals
~exceeds
+18dBm
this
LED
will
flash.
+18
dBm
is
JdB
lo
·
wer
th,:m
the
SE-400
's
clip
point.
Thus,
the
user
is
warned
in
advance
of
a
posibble
distortion
condition.
By
turning
the
input
level
control
downward
until
the
LED
stops
flashing
the
109
Bell
Streat,
Seattle,
\Va.98121. U.S.A.
(206)
624-5012
SE-400
Instruction
M~nual
continued
proper
setting
of
the
input
control
will
be
reached.
The
Subsonic
Filter
Page
4.
The
subsonic
filter
switch
which
is
positioned
on
each
channel
directly
above
the
input
level
control
has
a
yellow
LED
which
lights
when
the
filter
is
engaged
in
the
circuit.
The
subsonic
filter
is
actually
a
"high-pass"
filter.
This
means
that
it
cuts
out
low
frequencies
and
only
passes
high
frequencies
above
a
certain
cut-off
frequency.
In
the
SE-400
the
cut-off
frequency
is
fixed
at
35
HZ,
with
a
roll-off
of
18dB
per
octave.
This
means
that
when
the
sub-sonic
filter
is
switched
in
the
level
of
a
tone
with
frequency
of
17.5
HZ
is
18dB
below
that
of
a
tone
at
35HZ.
More
simply,
when
engaged
the
sub-sonic
filter
removes
all
super
low
tones,
rumble,
and
low
frequency
vibrations.
The
subsonic
filter
switches
in
and
out
of
the
signal
path
totally
independently
of
the
parametric
EQ
switch.
The
Parametric
EQ
in/out
switch
The
parametric
EQ
in/out
switch
is
located
on
each
channel
directly
above
the
sub-sonic
filter
switch.
As
you
may
have
already
guessed,
this
switch
is
the
master
switch
to
·
ehgage
or
disengage
the
four
parametric
bands.
When
the
switch
is
pressed
in~ard
a
green
LED
lights,
indicating
the
parametric
is
in
the
circuit.
Input
and
Output
Connections
The
input
and
output
connectors
located
on
the
rear
panel
of
the
SE-400
are
clearly
labelled
for
both
channels.
Connections
should
be
made
by
using
standard~"
phone
plugs
('tip-sleeve'.
t~p~t.
'
109
Bell
Street,
Seattle,
\'la.
98121 U.S.A.
(206)
62'1-5012
Page
S.
SE-400
Instruction
Manual
continued
Customer
Service
and
Apolications
Assistance
If
you
have
questions
r~garding
applications
or
if
you
need
assistance
in
learning
how
to
use
the
SE-400
please
consult
your
Symetrix
dealer
first.
If
you
need
additional
information
or
if
you
have
a
defective
unit,
then
call
or
write
our
factory
directly
(
sorry,
we
do
not
accept
collect
calls).
We
pride
ourselves
in
friendly,
efficient
customer
service.
:·
Jormal
"turn-around
time"
is
one
working
day.
You
must
pre-pay
freight
to
the
factory.
UPS
is
preferred.
We
pre-pay
the
return
freight.
tn
any
case,
please
call
first
for
RETURN
AUTHORIZATION.
109
Bell
Street,
Seattle,
'\Va. 98121 U.S.A.
(206)
621-5012
SE-400
Stereo
Parametric
Equalizer
The Symetrix SE-400 Stereo
Para-
metric Equalizer is a professional
signal processing tool which offers the
user state of the art sonic performance
from adevicewhich has been painstak-
ingly designed and constructed with
the professional
in
mind. The same
attention to quality, uncompromising
performance, and workingman's
Features
Each channel of the SE-400 has four
overlapping frequency bands:
low,
low-mid, high-mid, high (see reverse
side for exact specifications).
The controls per band include: fre-
quency (sweepable over a 3
Y,
octave
range), bandwidth (variable from a
twentieth of
an
octave to over 3 oc-
taves), and amplitude
(+
/-
16dB).
A master in/out switch with a green
LED status indicator switches the
equalizer
in
or
out of the circuit.
In addition to four band fully para-
metric equalization the SE-400 fea-
tures
an
independently switchable
sub-sonic filter. This filter
is
especially
useful for correcting the results
of
un-
satisfactory acoustical conditions
either in the studio
or
on stage. The
sub-sonic filter has a sharp 18dB/
octave slope with roll-off beginning
Symetrix
at 35 Hz. Acoustical
or
mechanical
"rumble" or proximity effects
economy which typifies the entire line
of Symetrix signal processing de-
vices
has
been built into the SE-400.
The SE-400 overcomes the lack of
flexibility inherent
in
graphic equaliz-
ers (octave andthird octave).With
the SE-400's parametric controls it
is
caused by super close micing tech-
niques are just some
of
the problems
easily corrected with the SE-400's sub-
sonic filter. A yellow LED indicates
"in circuit" status of the sub-sonic filter.
Each channel of the SE-400 also in-
corporates
an
input level control which
is
variable over a
30dB
range. Up to
10dB of gain
or
20dB of attenuation
is
available for matching incoming signal
levels to the SE-400's input. Proper
setting
of
the input level controls is
simplified by the SE-400's peak level
LEDs' which flash at
an
equalizer out-
put level
of
+18dBm
(approximately
2 or 3
dB
below the equalizer's clip
point) letting the user know of a poten-
tial overload condition.
The SE-400 is packaged
in
a rugged
painted steel chassis with black
anodized aluminum front panel. Knob
caps are color coded for easy identifi-
cation of function.The chassis
is
stan-
dard 19" rack mounted width but oc-
cupies only 3
Y,
" of vertical rack space.
4211
24th Avenue West
Seattle, Washington, 98199, USA
Telephone (206) 282-2555
Telex 703282 SYMETRIX UD
Data Sheet
the user that determines the exact
parameters of equalizer operation, not
the manufacturer.
You
select the exact
frequency centers and bandwidths for
your own application.
The SE-400
is
normally supplied with
unbalanced inputs and outputs using
standard ){" phone jax. For those ap-
pl
ications requiring balanced line op-
eration the model SE-4008 may be
ordered. The SE-4008 utilizes trans-
formerless electronically balanced
inputs and outputs which give trans-
parent, distortionless performance
along with the hum and noise rejec-
tion advantages of balanced opera-
tion. 3-pin, XLR-type connectors are
used on the SE-4008.
For more information or a demonstra-
tion, connect with your local Symetrix
dealer.
Symetrix
SE-400
Stereo Parametric
Equalizer
The
Symetrix SE-400 Stereo Para-
metric Equalizeris a professional
signal processing tool which offers the
userstate
of
the art sonicperformance
from a devicewhich has been painstak-
inglydesigned and constructed with
the professional
in
mind.Thesame
attentionto quality,uncompromising
performance,and workingman's
Features
Each channel
of
the SE-400hasfour
overlappingfrequency bands: low,
low-mid,high-mid, high (see reverse
sidefor exact specifications).
Thecontrols per band include:fre-
quency (sweepableover a 3
Y2
octave
range),bandwidth (variablefrom a
twentieth ofan octaveto over3 oc-
taves),and amplitude
(+
/-16dB).
A masterin/out switch with a green
LED status indicatorswitchesthe
equalizerin oroutofthe circuit.
In
addition to four band fully para-
metricequalization the SE-400fea-
tures an independentlyswitchable
sub-sonicfilter. Thisfilter is especially
useful forcorrecting the results ofun-
satisfactoryacoustical conditions
eitherin the studiooron stage.The
sub-sonicfilter has a sharp 1BdB/
octaveslope with roll-off beginning
at 35 Hz.Acoustical ormechanical
"rumble"
or
proximityeffects
economywhich typifiesthe entire line
ofSymetrix signal processing de-
vices has been built into the SE-400.
The
SE-400overcomesthe lack
of
flexibility inherentin graphic equaliz-
ers (octave and third octave).With
the SE-400's parametriccontrols
it
is
caused by superclose micing tech-
niques arejustsomeofthe problems
easilycorrected with the SE-400's sub-
sonic filter.A yellow LED indicates
"
in
circuit" statusofthe sub-sonic filter.
Eachchannel
of
the SE-400 also in-
corporatesan input level control which
is variable
over
a 30dBrange. Upto
1
OdB
ofgain or20dB ofattenuation is
available for matching incomingsignal
levelsto the SE-400's input. Proper
setting
of
the input level controls is
simplified bythe SE-400's peak level
LEDs'which flash at an equalizerout-
putlevel of
+18dBm
(approximately
2
or
3
dB
belowthe equalizer's clip
point) letting the userknow of a poten-
tial overload condition.
The
SE-400 is packaged in a rugged
painted steel chassiswith black
anodized aluminumfront panel. Knob
caps are colorcoded for easy identifi-
cation offunction.The chassis is stan-
dard
19"
rack mountedwidth butoc-
cupiesonly 3Y
2"
ofvertical rack space.
109 Bell
Street
Seattle
,
Washington
98121 ,
USA
Telephone
(206)
624-5012
DataSheet
the userthatdetermines the exact
parametersofequalizeroperation,not
the manufacturer.
You
selectthe exact
frequency centers and bandwidthsfor
yourown application.
TheSE-400 is normally supplied with
unbalanced inputs and outputs using
standard
Y4
" phonejax. Forthose ap-
plications requiring balanced line op-
eration the model SE-400Bmay be
ordered.
The
SE-400B utilizestrans-
formerless electronicallybalanced
inputsand outputs which givetrans-
parent, distortionless performance
along with the hum and noiserejec-
tion advantagesofbalanced opera-
tion.3-pin,XLR-type connectors are
used on the SE-400B.
Formore information or ademonstra-
tion,connectwith your local Symetrix
dealer,orcall orwrite: Symetrix,109
Bell Street, Seattle,WA
98121
U.S.A.
(206) 624-5012.
Professional
Audio
Products
Symetrix
SE-400
Stereo Parametric
Equalizer
The Symetrix SE-400Stereo Para-
metric Equalizeris a professional
signal processing tool which offers the
userstate ofthe art sonic performance
from a devicewhich hasbeen painstak-
inglydesigned and constructed with
the professional
in
mind.
The
same
attention to quality, uncompromising
performance,and workingman's
Features
Each channel ofthe SE-400 has four
overlappingfrequency bands: low,
low-mid,high-mid,high (see reverse
side for exactspecifications).
The
controlsperband include: fre-
quency (sweepableovera 3
Y2
octave
range), bandwidth (variable from a
twentieth
of
an octaveto over3 oc-
taves),and amplitude
(+
/-16dB).
A masterin/outswitch with a green
LED status indicatorswitchesthe
equalizer
in
orout ofthe circuit.
In
addition tofour band fully para-
metricequalization the SE-400 fea-
tures an independentlyswitchable
sub-sonicfilter.Thisfilter is especially
usefulfor correcting the results of un-
satisfactoryacoustical conditions
eitherin the studiooron stage.The
sub-sonicfilter has a sharp 18dB/
octaveslope with roll-off beginning
at 35 Hz. Acoustical ormechanical
"rumble" orproximityeffects
economywhich typifiesthe entire line
of
Symetrixsignal processing de-
vices hasbeen builtinto the SE-400.
The
SE-400overcomesthe lack of
flexibility inherentin graphicequaliz-
ers (octave and third octave).With
the SE-400's parametriccontrols
it
is
caused by superclose micing tech-
niquesarejust some ofthe problems
easilycorrected with the SE-400's sub-
sonicfilter.A yellow LED indicates
"
in
circuit" status
of
the sub-sonicfilter.
Eachchannel ofthe SE-400 also in-
corporatesan input level control which
is variable
over
a 30dBrange. Up to
10dBofgain or20dBofattenuation is
available for matching incomingsignal
levelsto the SE-400's input. Proper
setting
of
the inputlevel controls is
simplified bythe SE-400'speak level
LEDs' which flash at an equalizerout-
put level of
+18dBm
(approximately
2or 3
dB
belowthe equalizer's clip
point) letting the userknow of a poten-
tial overload condition.
The SE-400 is packaged in a rugged
painted steel chassiswith black
anodized aluminum front panel. Knob
caps are colorcoded for easy identifi-
cation offunction.Thechassis is stan-
dard
19"
rack mounted width butoc-
cupiesonly 3W ' ofvertical rack space.
109 Bell
Street
Seattle
,
Washington
98121
,
USA
Telephone
(206)
624-5012
DataSheet
the
user
that determinesthe exact
parametersofequalizeroperation,not
the manufacturer.
You
selectthe exact
frequency centers and bandwidths for
yourown application.
TheSE-400 is normally supplied with
unbalanced inputs and outputsusing
standard
1/4"
phonejax.Forthose ap-
plications requiring balanced line op-
eration the model SE-400B maybe
ordered.The SE-400B utilizestrans-
formerless electronically balanced
inputsand outputs which givetrans-
parent, distortionless performance
along with the hum and noise rejec-
tion advantagesofbalanced opera-
tion.3-pin,XLR-type connectors are
used on the SE-400B.
Formore information ora demonstra-
tion,connectwith yourlocal Symetrix
dealer,orcall orwrite: Symetrix,109
Bell Street, Seattle,WA
98121
U.S.A.
(206) 624-5012.
Professional
Audio
Products
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BOPR.D
1
5A
Input impedance:
Output impedance:
Maximum input level:
Maximum output level:
Total Harmonic Distortion:
400 Hz
to
50K Hz
passband:
Broadband:
Crosstalk, either channel driven at
+10 dBv
into
600 ohms:
Hum
and
Noise:
Sub-sonic Filter:
Amplitude control:
Bandwidth control:
Frequency control:
Size:
Shipping weight:
Power requirements:
SE-400
Specificatlons
47K ohms, unbalanced (SE-400)
10K ohms, balanced bridging (SE-400B)
100 ohms, unbalanced (SE-400)
400 ohms, balanced (SE-400B)
+20 dBm
+20 dBm (into 10K ohms)
+18.5 dBm (into 600 ohms)
(measured
with all equalizer controls centered,
EO
and
Sub-sonic
switches
"in",
0 dBv
signal
levels)
.007% THO
.012% THD
-86
dBv
(measured
with
input terminated in 600
ohms,
20K
Hz
test bandwidth,
EO
and
Sub-sonic switches
"in",
all controls centered): -86 dBv
(Measured
with
EO
and
Sub-sonic switches
"out":)
-95 dBv
Maximally
flat
frequency
response,
3 dB down at 35 Hz,
18dB/Octave roll-off
±
16
dB, all
bands
.16 octave
to
3.3
octaves,
all
bands
16 Hz
to
512 Hz, low band
56 Hz
to
1.8K Hz, low-mid band
196
Hz
to
6.'3K Hz, high-mid
band
686 Hz
to
22K Hz, high band
Standard
19"
rack mount,
3.5"
high,
7.9"
deep
(48.25 x
8.9 x 20.1 cm)
12 lbs (5.4 kg)
117 VAC ±
10%
mains fused, internally current limited (other
voltages
available upon request)
Prices
and
specifications
of
Symetrix products
are
subject
to
change
without
notice.
Table of contents
Other Symetrix Stereo Equalizer manuals
