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SECTION
I
INTRODUCTION
FIGURE
1.
MODEL
535
FRONT PANEL.
NOTE: This manual
contains complete instructions
for the
operation
of the two
-channel "Dual Graphic Equalizer" Model
535.
However, this manual
is
also intended for
the
single channel
"Graphic Equalizer" Model
533.
If
used with
a
Model
533,
all
references
to the
two -channel unit should
be
disregarded.
1.1
DESCRIPTION
The Model 535 Dual
Graphic Equalizer
is
a
studio quality
product which has wide application
in
recording, sound reinforcement,
radio
and TV
production, and high fidelity music systems.
The system
is
designed
to
operate
at
any nominal level from
as
low as -20 dB (Ref. 0.775
V)
allowing
its use
with low level
mixers, high or low impedances, and balanced or single -ended
circuits.
The Model 535 provides
12
dB of
boost
or cut at each
of
its 10
frequencies which are centered
at ISO
1
-octave increments
from 31.5
Hz to 16
kHz.
The
positions
of the
control arms
of the
vertical, stepless controls provide
a
graphic representation
of
the
response curve selected.
The filters are active,
minimum
phase,
2
-pole synthesized
LC
networks, whose skirts properly combine for
minimum ripple
and
phase shift when
used
in
combination.
A
front panel control
adjusts
the
gain from -10 dB
to
+20
dB.
Bypass switches permit
switching
the
equalization out
for A
-B
tests.
An
optional
(SC -1)
security cover may be installed
to
protect
all
operating controls
against inadvertent disturbance
or
tampering
in
fixed installations.
-1-
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