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Peavey XR 400B User Manual

Peavey XR 400B
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CHANNEL
EQUALIZATION
CONTROLS
The
channel
equalization
controls
are
of
the
active
“shelving’’
type
and
provide
15
dB
ol
boost
or
cut
in
their
respective
frequency
ranges.
These
equalization
controls
are
extremely
effeclive
and
will
allow
the
user
to
achieve
almost
any
blend
of
highs
and
lows
with
proper
adjustment.
Since
these
EO
controls
are
capable
of
a
30
dB
range,
care
should
betaken
to
properly
utilize
their
capabilities.
Excessive
boosting
of
lows
can
cause
'‘muffled"
or
"boorry"
sounds,
as
well
as
tending
to
prematurely
overload
the
power
amp
because
of
excessive
low
frequency
power
requirements.
Overboosting
the
highs
will
tend
to
cause
a
“strident"
or
"screechy”
tonality,
as
well
as
tending
to
emphasize
residual
preamp
noise
and
susceptibility
to
acoustic
feedback.
Care
should
be
observed
when
using
excessivecut
in
either
frequency
range
since
excessive
cutting
may
degrade
the
dynamic
range
capabilities
of
the
input
preamp
and
create
poor
tonality.
These
channel
equalization
controls
have
been
provided
to
achieve
tonal
balance,
as
well
as
feedback
control
in
the
individual
channels
for
the
main
mix
only.
All
experimentation
should
begin
with
these
controls
set
in
the
flat
"0"
(straight
up
or
12:00)
position
Use
of
the
individual
channel
controls
in
conjunction
with
the
master
graphic
equalizer
is
vital
to
provide
the
user
with
optimum
equalization.
CHANNEL
LOW
EQUALIZATION
CONTROL
(E)
The
low
equalization
control
determines
whether
the
low
frequencies
will
be
boosted
or
cut.
Boost
occurs
in
the
clockwise
settings,
while
cut
occurs
in
the
counterclockwise
settings
Fiat
response
is
obtained
in
the
"0”
or
vertical
position.
CHANNEL
HIGH
EQUALIZATION
CONTROL
(F)
The
high
equalization
control
determines
whether
the
high
frequencies
will
be
boosted
or
cut.
Boost
occurs
in
the
clockwise
settings,
while
cut
occurs
in
the
counterclockwise
seltings.
Flat
response
is
obtained
in
the
"0"
or
vertical
position.
CHANNEL
EFFECTS
CONTROL
(G)
The
channel
effects
send
control
adjusts
the
signal
level
applied
to
the
effects
mix
bus
which
feeds
the
internal
reverberation
system,
as
well
as
the
effects
output
on
the
patch
panel.
The
overall
settings
of
the
channel
effects
send
controls
determine
the
amount
o'
reverb
drive,
as
well
as
the
signal
output
level
available
from
the
effects
output
jack.
It
is
important
to
note
that
the
effects
send
control
is
a
"post
type
adjustment
which
is
located
in
the
circuit
alter
the
channel
gain
and
equalization
controls.
The
user
should
be
aware
that
use
of
the
internal
reverberation
system
can
only
occur
when
the
channel
gain,
the
channel
effects
send,
the
master
reverb
return
and
the
master
gain
controls
are
all
properly
adjusted.
MASTER
SECTION
The
XR-4C0B
master
section
contains
the
overall
master
evel
control,
the
master
monitor
control
and
the
reverb
return
(to
master)
control,
as
well
as
a
five-band
graphic
equalizer
and
patch
panel.
As
the
name
implies,
the
master
controls
operate
as
the
final
control
element
for
their
respective
mixing
buses
and
the
master
graphic
EQ
determines
the
final
overall
equalization.
MASTER
LEVEL
CONTROL
(H)
The
master
level
control
adjusts
the
gain
ol
the
main
mixing
bus
and
determines
the
level
at
the
main
line
output
jack
<Q>.
as
well
as
determining
the
signal
level
applied
to
the
input
of
the
graphic
equalizer/power
amplifier,
it
is
general
y
good
practice
to
operate
the
master
level
control
somewhere
in
the
middle
of
its
operating
range
to
allow
maximum
flexibility
in
adjusting
overall
levels;
i.e.,
it
is
poor
practice
to
run
the
individual
channel
gains
way
up
and
the
master
control
way
down
since
this
limits
the
headroom
of
the
input
stages
and
could
cause
distortion
MASTER
MONITOR
LEVEL
CONTROL
(I)
The
master
monitor
control
adjusts
the
gain
of
the
monitor
mixing
bus
and
determines
the
level
of
the
signal
available
from
the
monitor
output
jack
(P).
The
operation
of
this
control
and
its
independent
channel
sends
is
identical
to
that
of
the
main,
with
the
exception
that
its
output
is
applied
to
the
monitor
line
output
jack
instead
of
the
main
output
jack.
MASTER
REVERB
RETURN
CONTROL
<J)
The
master
reverb
control
determines
the
amount
of
delayed
signal
(reverberation)
that
is
mixed
back
into
the
main
mix
bus.
The
action
of
this
control
(J)
is
defeated
by
use
of
a
remote
switch
being
plugged
into
the
fcotswitch
jack
(M)
located
on
the
patch
panel,
it
is
important
to
note
that
no
reverberation
will
occur
unless
the
internal
delay
line
is
being
fed
signals
from
the
channel
effects
send
controls.
The
master
reverb
return
control
does
not
affect
the
level
available
from
the
effects
output
jack
located
on
the
patch
panel
(Ol
GRAPHIC
EQUALIZER
(K)
This
five-band
equalizer
is
ol
the
latest
active
type
and
exhibits
performance
comparable
to
that
found
in
the
finest
commercial
equipment.
The
graphic
equalizer
is
located
in
the
circuit
just
before
the
internal
100
watt
power
amplifier
and
provides
a
very
versatileand
professional
equalization
of
the
overall
system.
Because
of
the
flexibility
built
into
the
XR-400B,
several
different
modes
of
operation
are
possible.
NORMAL
MODE
Under
normal
operating
conditions
(no
patch
connections),
the
equalizer
is
connected
through
the
graphic
input
switching
jack
tothe
main
output
which
is
the
signal
derived
from
the
main
mixing
bus
and
controlled
by
the
master
gain
control.
MONITOR
OPERATION
The
graphic
equalizer
and
internal
power
amp
may
be
used
to
power
a
monitor
system
by
simply
patching
from
the
monitor
output
tothe
graphic
input
using
a
short
shielded
patch
cable.
When
this
patch
is
accomplished,
the
signalfrom
the
main
mixing
bus
is
available
only
at
the
output
jack
(P)
on
the
paten
panel
to
be
used
in
conjunction
with
external
power
amps,
equalizers,
or
other
accessories
MASTER
EQUALIZATION
The
master
graphic
ecualizer
is
designed
to
provide
room
equalization
and
overall
system
lone
control.
It
is
important
to
note
that
there
are
no
firm
operating
instructions
that
will
result
in
the
ideal
EQ
for
each
and
every
set
of
operating
conditions.
Experimentation
with
adequate
understanding
of
the
graphic
equalizer
is
necessary
to
achieve
optimum
results
No
amount
of
equalization
will
correct
an
acoustically
bad
room/mike/speaker
arrangement
or
completely
correct
the
response
curve
of
a
poor
loudspeaker
Please
make
sure
that
the
power
amplifier
has
adequate
headroom
to
handle
any
boost
that
may
be
incurred.
If
you
boost
100
Hz
by
3
dB.
your
power
requirement
will
double.
As
an
example,
if
your
normal
performing
level
requires
100
watts,
the
power
required
after
a
3
dB
equalization
boost
will
be
200
watts
You
should
always
begin
operation
with
the
equalizers
in
the
“0"
or
center
position.
It
is
wise
to
avoid
excessive
cutting
of
large
segments
of
the
audio
passband
since
this
tends
to
reduce
the
dynamic
range
of
the
system.
Also
it
is
better
to
raise
the
level
control
rather
than
to
use
the
majority
of
the
equalizers
in
the
boost
position
since
overall
signa!-to-noise
ratio
will
result.
As
with
any
equalizer
device,
careful
experimentation
and
a
little
common
sense
will
yield
the
desired
result.
PILOT
LED
(L)
The
pilot
LED
indicates
when
the
electrical
supply
is
switched
on
and
is
actually
delivering
power
to
the
amplifier

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Peavey XR 400B Specifications

General IconGeneral
BrandPeavey
ModelXR 400B
CategoryAmplifier
LanguageEnglish

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