Peavey XR 400 User Manual

(RAO
OPERATING
GUIDE
‘CAUTION
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GENERAL DESCRIPTION
The
new
XR-400
represents
our
latest
effort
to
combine
professional
features
previously
tound
only
in
separate
mixer
/equalizer/power
amp
components
into
a
single
compact
and
rugged
package.
The
design
ot
ihe
XR-400utlizes
the
latest
advances
in
semiconductor
technology
and
the
overall
circuitry
has
deen
designed
and
optimized
by
use
of
the
latest
computer-aided
design
techniques.
This
unit's
improved
specifications
have
been
made
possible
by
a
thorough
and
complete
design
elfort
resulting
in
all
new
circuitry
from
the
input
jack
through
to
the
speaker
output.
The
XR-400
features
four
independent
input
channels
and
includes
a
separate
“pre”
monitor
send,
active
shelving
type
high
and
low
equalization,
and
a
“post”
elfects
send
orreach
channel.
Master
levelcontrols
are
provided
for
the
main,
monitor,
and
reverb
return,
A
full
five-bend
(raphicequalizer
nas
been
buit
ino
tne
systemand
utilizes
the
most
contemporary
active
filter
circuitry
available.
Additional
ilxibilt
is
providedby
ine
XR-400's
patch
panel,
enabling
this
versatile
unit
to
be
used
in
conjunction
with
an
extremely
wide
range
of
auxiliary
equipment
The
100-watt
power
amplitier
of
the
XR-400
utilizes
four
high-voltage.
high-speed
TO-3
power
devices
bolted
to
a
massive
heatsink.
The
Inernal
power
supply
consists
ofa
very
large
power
(mains)
transformer
featuring
agrain
oriented
silicon
stool
core
and
a
high
degree
of
magnetic
shielding
10
minimize
extraneous
hum
fields.
Silicon
rectifiers
connected
in
a
full
wave
bridge
leed
power
to
large
electrolytic
fiter
banks
and
provide
considerably
more
music
power
than
the
100-watt
RMS
power
rating
would
indicate
Overall,
the
XR-400
brings
professional
performance
together
in
an
extremely
versatile
and
compact
package,
offering
features
and
specifications
formerty
avilable
only
with
separate
components
in
a
single
portable
package.
FRONT PANEL
INPUT JACKS (A) and (B)
Each
channel
of
the
XR-400
is
equipped
with
two
input
jacks
which
are
connected
in
a
unique
circuit
that
allows
a
wide
range
of
inputs
tobe
handie.
When
only
one
microphone
is
used,
the
“A”
input
jack
is
more
sensitive
than
the
“B”
input
jack.
This
high
end
low
gain
feature
enables
‘optimum
microphone
matching.
If
a
high
output
microphone
is
overloading
the
sensitive
“A”
input,
simply
reconnect
thismike
into
the
lowgain
‘B’
jack,
When
two
inputs
are
used
in
each
channel,
the
input
circuit
automatically
balances
to
equalize
the
gain
in
both
Aand
B
jacks.
This
simpie,
but
effective.
switching
system
gives
the
user
much
greater
flexibility
in
choice
of
input
sensitiviies
and
overload
protection,
CHANNEL CONTROLS.
Each
of
the
XR-400's
four
independent
channels
contain
five
controls:
Gain,
Monitor,
Effects
and
High
and
Low
Equalization.
CHANNEL
GAIN
CONTROL
(C)
Tne
channel
gain
contiol
varies
the
gain
of
the
input
preampifier.
This
input
preamp
is
designed
arounda
variable
negative
feedback
approach
and
provides
optimum
dynamic
range
as
well
as
extremely
low
noise
operation.
This
control
is
used
to
set
the
level
of
the
respective
channels
to
achieve
the
main
mix.
CHANNEL MONITOR CONTROL (D)
The
channel
monitor
control
isa
totally
independent
level
adjustment
used
for
deriving
the
proper
monitor
mix.
Itisimportant
thatthe
userbe
aware
thal
th
channel
monitor
send
is
totaly
independent
from
all
other
channel
controls
and
feeds
directly
into
the
monitor
buss
whose
output
is
detemine
by
the
master
monitor
control
(1).
CHANNEL EQUALIZATION CONTROLS
The
channel
equalization
controls
are
of
the
active
“shelving”
type
and
provide
15
dB
of
boost
or
cut
in
their
respective
frequency
ranges.
These
equalization
controis
are
extremely
effective
and
wil
allow
the
user
to
achieve
almost
any
blend
of
high’s
and
low's
with
proper
adjustment.
Since
hese
EQ
controls
are
capable
of
a
30
cB
range,
care
shouid
be
taken
to
properly
utilize
their
capabilities.
Excessive
boosting
of
low's
can
Cause
“muffied”
or
"boomy"
sounds,
as
well
as
tending
to
prematurely
overload
the
power
amp
because
of
excessive
low
frequency
power
requirements.
Ove-boosting
the
high’s
will
tenc
to
cause
a
strident”
or
“screechy”
tonality,
as
well
as
tending
toemphasize
residual
preamp
noise
‘and
susceptibility
to
acoustic
teodback.
Care
should
be
observed
when
using
excessive
cutin
either
frequency
rangesince
excessive
cutting
may
degrade
the
dynamic
range
capabilities
of the
input
preamp
and
create
poor
tonality.
These
channel
equalization
controls
have
been
pravidedto
achieve
tonal
balance,
as
well
2s
feedback
control
in
the
individual
channels
for
the
main
mix
only.
All
oxporimentation
should
begin
with
these
controls
set
in
the
flat
“0”
(straight
up
or
12:00)
position.
Use
of
the
individual
channe!
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
froquencios
willbe
boosted
or
cut.
Boost
occurs
in
the
clackwis
occurs
in
the
counterclockwise
settings.
Flat
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
occursin
the
clockwise
settings,
while
cut
occurs
in
the
counterclockwise
settings.
Flat
response
is
obtained
n
the
O’
or
vertical
postion
CHANNEL
EFFECTS
CONTROL
(G)
The
channel
effects
send
control
adjusts
the
signal
level
applied
to
the
effects
mix
buss
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
of
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
isa
“post”
typeadustment
which
is
located
in
the
circutt
after
the
channel
gain
and
equalization
controls.
The
user
should
be
aware
thai
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-400
master
section
contains
the
overall
master
level
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
busses
and the
master graphic
EQ
determines
the
final
overall
equalization,
MASTER LEVEL CONTROL (H)
The
master
level
control
adjusts
the
gain
of
the
main
mixing
buss
and
determines
the
level
at
the
main
line
output
jack
(Q).
as
well
as
determining
the
signal
level
applied
to
tha
input
of
the
graphic
equalizer
/
poxer
amplifier.
Itis
generally
good
practice
to
operate
the
master
level
control
somewhere
in
the
middle
of
its
operating
range
to
allow
maximum
flexibility
in
adlusting
overall
levels.
ie. it
i
poor
practice
to
run
the
individual
channel
gains
way
up
ard
the
master
control
way
down
since
this
limits
the
headroom
ol
the
input
stages
and
could
cause
cistortion
tings, while cut

Peavey XR 400 Specifications

General

Brand	Peavey
Model	XR 400
Category	Music Mixer
Language	English