3
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1.
INTRODUCTION
Congratulations
on
your
purchase
of
an
A
shly
DL
M-821
stereo
duc
k
ing
line
le
v
el
mi
x
er.
F
eatures
include
eight
b
alanced
stereo
inputs
for
line
le
v
el
sources,
the
first
four
inputs
w
ith
s
w
itcha
b
le
30dB
gain
for
lo
w
impedance
microphones.
+
18
V
phantom
po
w
er
and
stereo/mono
s
w
itch-
ing
is
pro
v
ided
for
inputs
1
through
4.
A
concentric
le
v
el
and
pan
control
for
each
input
ad
j
usts
channel
v
olume
and
stereo
position.
A
duc
k
ing
circuit
allo
w
s
a
signal
on
either
channel
1
or
2
to
duc
k (
attenuate
)
the
signal
on
channels
3
through
8.
I
nternally
the
DL
M-821
can
b
e
configured
for
ch.1
pri-
ority
w
here
b
y
a
signal
on
ch.
1
has
priority
o
v
er
the
signal
on
ch.
2
and
fully
attenuates
channels
2
through
8.
F
urther-
more,
the
duc
k
ing
le
v
el
can
b
e
configured
for
-20dB
or
-90dB,
ch.
2
duc
k
ing
may
b
e
disa
b
led,
and
the
left
and
right
signal
duc
k
ing
may
b
e
disa
b
led
independently.
U
ltra
lo
w
noise
summing
amplifiers
com
b
ine
the
channel
signals
for
the
main
outputs.
A
pair
of
6-segment
LED
meter
arrays
monitor
the
main
output
le
v
els.
Separate
le
v
el
controls
are
pro
v
ided
for
stereo,
mono,
and
headphone
outputs.
2.
UNPACKING
A
s
a
part
of
our
system
of
q
uality
control,
e
v
ery
A
shly
product
is
carefully
inspected
b
efore
lea
v
ing
the
factory
to
ensure
fla
w
less
appearance.
A
fter
unpac
k
ing,
please
inspect
for
any
physical
damage.
Sa
v
e
the
ship-
ping
carton
and
all
pac
k
ing
materials
,
as
they
w
ere
care-
fully
designed
to
reduce
to
minimum
the
possi
b
ility
of
transportation
damage
should
the
unit
again
re
q
uire
pac
k
-
ing
and
shipping.
I
n
the
e
v
ent
that
damage
has
occurred,
immediately
notify
your
dealer
so
that
a
w
ritten
claim
to
co
v
er
the
damages
can
b
e
initiated.
T
he
right
to
any
claim
against
a
pu
b
lic
carrier
can
b
e
forfeited
if
the
carrier
is
not
notified
promptly
and
if
the
shipping
carton
and
pac
k
ing
materials
are
not
a
v
ail-
a
b
le
for
inspection
b
y
the
carrier.
Sa
v
e
all
pac
k
ing
mate-
rials
until
the
claim
has
b
een
settled.
3.
AC
POWER
REQUIREMENTS
T
he
DL
M-821
w
ill
perform
normally
from
98
to
125
v
olts
A
C.
U
se
only
properly
grounded
A
C
recep-
tacles.
T
o
reduce
the
ris
k
of
ground
loop
hum,
use
a
cen-
tral
point
for
system
A
C
po
w
er
distri
b
ution.
T
he
A
C
line
fuse
is
internal,
and
should
only
b
e
changed
b
y
a
q
uali-
fied
ser
v
ice
technician.
4.
SECURITY
COVERS
F
or
installations
w
here
it
is
desira
b
le
to
protect
the
front
panel
controls
from
tampering
or
accidental
misad
j
ustment,
use
the
A
shly
security
co
v
er,
w
hich
is
a
v
aila
b
le
in
b
oth
single
and
dou
b
le
rac
k
space
si
z
es.
I
n-
stallation
is
simple
and
does
not
re
q
uire
remo
v
al
of
the
e
q
uipment
from
your
rac
k
.
See
your
A
shly
dealer
for
details.