Orban 674A - Front Panel Controls Explained

'Q"
is
variable
between
0.5
and 10
—
"Tic"
marks on
TUNING and
BANDWIDTH
controls guide
you
to
octave-band
graphic
equalization
settings
Bands are
totally
non-interacting
LP/HP
Filter Sections
Each
section is
continuously
tunable
over
100:1
range in
2 decades
—
Each
section is
independently
switchable
l2dB/octave
slopes
~
Separate
highpass
and
lowpass
outputs
permit use
as
full
electronic
crossover
in
the
range of
200-2000Hz
General
l2dB
available
gain
Very
low noise
and
distortion
High slew
rate for
minimum
TIM
(SID)
—
"Peak-stretching"
overload
lamp
warns of
clipping
anywhere
in
equalizer
before
distortion is
audible
—
EQ
controls
are
long-throw
dust-shielded
sliders
for
good
resolution
—
Industrial-grade
parts
and
construction,
including
socketed
IC's
RFI suppression on
input,
output,
and
power
leads
Balanced
output
optional
(order
retrofit kit
as
required)
—
Holes for
XLR-type
connectors
are
provided
(retrofit
kit
available)
FRONT
PANEL
DESCRIPTION
The
GAIN control
adjusts
the
drive
level
to
the
filters
and
equalizers.
The
OVERLOAD
indicator
monitors
all critical
points to
warn
of
excessive
signal
amplitude
due
to
excessive
input
amplitude
or
to
large
amounts
of
peak boost
equalization.
Overloads
are
eliminated
by
turning
down the
GAIN control.
The
EQ
IN/OUT switch
defeats
the
graphic
EQ section.
The
EQ controls
adjust
the
maximum
peak or
dip
in
each
band
over a
range
of
+
!6dB.
Center
detent
corresponds
to
flat
output
from
the
band.
The
TUNING
controls
adjust
the
center
frequency
of
each of
the
eight
bands
in
the
EQ section.
The
BANDWIDTH
controls
adjust
the
"Q"
(sharpness)
of
each
band
in
the
EQ
section.
The
"Q"
becomes
broader
when
turned
clockwise;
sharper
when
turned
counterclockwise.
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