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Lexicon PCM 42 - 3.4 Operating Levels; INPUT AND OUTPUT LEVEL SETTINGS

Lexicon PCM 42
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3.3
AUDIO
CONTROL
JACKS
The
PCM
42
has
two
audio
control
jacks
which
are
wired
in
T/R/S
configuration.
In
both
of
these,
the
sleeve
iS
a
common
ground,
and
a
single-ended,
buf-
fered
delay
output
appears
on
the
ring.
The
tips
of
the
jacks
are
connected
to
different
input
patch
points
in
the
PCM
42.
FEEDBACK
CONTROL
JACK
(Fig.
2.2,
J)
The
tip
terminal
of
this
eo
is
connected
to
a
patch
point
that
is
mixed
with
the
main
INPUT.
The
input
ac-
cepts
single-ended,
lin
Bega
ee
from
a
source
of
any
impedance.
Connecting
a
Lexicon
A-CP-41
foot
pedal
to
this
jack
places
the
foot
pedal’s
internal
poten-
tiometer
between
the
ring
and
the
tip,
mixing
the
delay
output
with
the
main
input
and
thus
allowing
remote
control
of
feedback
or
regeneration.
Since
the
delay-only
output
on
the
ring
is
bu
two-way
T/S
phone
plug
may
be
inserted
in
thi
mix
any
other
line-level
signal
with
the
mai
i
without
compromising
the
delayed
signal.
A
T/RY
plug
with
connections
to
the
ring
and
sleeve
only
will
permit
the
use
of
either
audio
control
jack
as
a
separate
delay-only
output.
="
et
¢
Pe
a
mA&ow
NOTE:
The
feedback
loop
enabled
by
this
control
jack
iS
separate
from,
and
operates
in
parallel
with,
the
front
panel
FEEDBACK
control
and
its
associated
HI-
CUT
and
FB
INV
switches.
If
the
two
controls
are
used
simultaneously,
runaway
feedback
(howling)
can
occur.
When
using
the
FEEDBACK
CONTROL
jack
with
the
foot
pedal,
turn
the
front
panel
FEEDBACK
control
to
0.
MIX
CONTROL
JACK
(Fig.
2.2,
K)
Inserting
a
phone
plug
into
this
jack
interrupts
the
connection
of
the
delay
signal
to
the
OUTPUT
MIX
con-
trol
on
the
front
panel.
A
foot
pedal
plugged
into
this
jack
allows
the
performer
to
fade
the
delay
effects
as
desired
from
zero
up
to
the
setting
of
the
OUTPUT
MIX
control.
This
jack
may
also
be
used
to
insert
other
signal
processors,
ane
as
equalizers,
into
the
path
of
the
delayed
signal.
The
input
accepts
single-ended,
line-
level
audio
from
a
source
of
any
impedance.
3.4
OPERATING
LEVELS
INPUT
LEVELS
The
PCM
42
can
handie
a
wide
variety
of
input
sources
including
microphones,
electric
instruments,
mixer
outputs
and
so
on.
The
high-impedance
delay
line
input
will
operate
equally
well
with
low-
or
high-
impedance
sources.
It
is
important,
however,
to
set
the
10
input
sensitivity
So
that
the
unit
can
acco
full
dynamic
range
of
the
source
i
aye
e;
~
signa
ai/noise
ratio
and
mmodate
the
with
£
To
match
the
PCM
42's
sensiti
the
source,
ae
must
first
set
rear
panel.
Push
the
button
in
(selecting
20
a
of
extra
ae
cee
when
using
sour
ue
with
peak
levels
ranging
from
-23
dBV
to
0
dBV
(0.07
V
to
1.0
V
rms).
This
in-
cludes
electric
pickups,
high
output
mireropuene
coe
level
mixer
outputs,
and
some
electronic
instr
pices
instrument
preamplifier
outputs.
ivity
to
input
the
20
dB
GAIN
switch
on
the
O
I
noul
Ihe
button
should
be
out
sources
with
peak
levels
rangir
70V
to
9.0
Vrms}.
This
output
Ss,
some
puts
and
some
(unity
gain}
when
using
ng
from
-3
dBV
to
+19
includes
high
level
mixer
e
electronic
instrument/preamplifier
out-
direct
box
outputs.
With
the
appropriate
switch
position
engaged,
adjust
the
front
panel
INPUT
LEVEL
control
for
peak
HEADROOM
displays
of
0
dB,
with
average
levels
around
-12
dB.
vel
is
unknown,
Start
at
the
0
dB
out),
and
adjust
the
INPUT
i
to
otk
g
the
HEADROOM
display
within
desi
red
paniaes
f
the
gain
is
insufficient
to
achieve
peaks
of
-6
dB
with
Ae
INPUT LEVEL
at
maximum,
turn
dov
he
INPUT
LEVEL
and
engage
the
+20
dB
positio
re
signal
ley
:
iE
itimm
fA:
SATIN
Eee?
1
(Dutton
WARNING
NEVER
CONNECT
THE
PCM
42
INPUT
DIRECTLY
TO
POWER
SOURCES,
IM-
PROPERLY
ISOLATED
AC/DC
DEVICES,
OR
POWER
AMPLIFIERS.
DISREGARDING
THESE
PRECAUTIONS
CAN
LEAD
TO
ELEC-
TRICAL
SHOCK,
AND
MAY
DO
SEVERE
DAMAGE
TO
THE
PCM
42.
MAIN
OUTPUT
LEVEL
The
PCM
42
MAIN
OUTPUT
is
designed
to
drive
loads
of
5
kilohm
or
higher
impedance
at
a
level
of
9
V
rms
(+18
dBV).
It
is
possible
to
drive
impedances
as
low
as
600
ohms,
although
maximum
output
level
is
reduced
to
about
5
V
rms
(+
14
dBV).
NOTE:
Do
not
use-the
INPUT
LEVEL
control
to
set
output
level.
Once
the
proper
input
level
is
established,
the
rear
panel
OUTPUT
LEVEL
control
can
be
used
to
adjust
the
MAIN
OUTPUT
level
for
a
wide
range
of
devices.
In
general,
best
signal-to-noise
performance
results
at
set-
tings
of
mid-scale
or
higher.

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