EA'GL'SH
REAR
PANEL
CONNECTIOT{S
l.
GFOUND. lf
your
turntable is
equipped with
a sep-
arale
grounding
wire,
connect it here
as follows. Turn
the
thumb-nut counter-clockwise. lf
the
grounding
wire is
ter-
minated in
a U-shaped spade lug,
place
it under
the thumb-
nut and tighten
lhe nut clockwise
to secure the lug.
lf the
grounding
wire has
no
terminal
lug,
strip
olf
a halt-inch
(1
to
2
cm) of insulation to
expose
the bare wire,
twist the
wire strands tightly
together, insert
the wire through
the
small
hole
in the
shatl of the
Ground terminal,
and tiqhten
the
lhumb-nut.
2. PHONO. Plug
the signal
cables from
your
turntable
into
these
jacks.
lf
the
cables
or
plugs
are
color-coded,
reler
to
your
turntable's
instructions to learn
which cable
or
plug
is for the
Lelt channel
and
which
is for
the
Right
channet.
Be
carelul to inserl
each
plug
fu,,y
inlo
lhe
jack
so that
the
plug
s metal
skirt fils tighlly over
the exlerior
of the
jack.
lf
necessary,
caretully
crimp
the
plug's
metal skirt
slightly
so
as lo obtain
a tight fit with the
jack.
.The
impedance
ot
the
phono
input
ls 4Z0OO
ohms
resistance
and 47
picolarads
capacitance, which
(when
considered together
with the cable
capacitance
ol a typ-
ical lurntable) is
suitable tor the maiority
ol
phono
pick-
up cartridges.
3. MM/MC
SELECTOR. This
switch
sets the inout
sensilrvity and
gain
ol the
phono
preampltfrer
circuit.
Set it
according to lhe
oulput
level
of
your phono
cartridge.
Move
the switch DOWN
(to
MM)
for
cartridges
of
the moving
magnet, induced
magnet, moving
flux,
and
moving
iron
(variable
reluctance)
types, and tor
"high-output"
moving-
coil
pickups
(i.e.,
those
with
a rated
output ol 1.0
mV or
greater).
lf
your
cartridge
is
a low-output
moving-coil
pickup
(rvilh
a rated
oulput of
less
than 1.0
mV), move the
switch
UP
(to
MC).
Here
is
another way to determine
the
preferred
setting
ot the
MM/MC
switch. Begin by
setting it to MM. After
you
have
completed the installation
and
wiring of the
amplitier,
play
a rocord.
You
should obtain a
satisfyingly loud volume
level
wiih
a VOLUME
control setting beiween
9 o'clock
and 3 o'clock. ll
you
have lo turn
up the VOLUME
control
beyond 3 o'clock
to
get
adequately
loud
sound,
turn
the
VOLUME back
down and
re-set
the
MM/MC switch
to MC.
4. TUNER.
Plug
the
signal
cables from
your
radio
tuner
into lhes€
iacks.
5.
AUX. The
auxiliary input
jacks
enable
you
to
connect
any
"line
level"
signal
source
to the
system-such
as an
eight-track
lape
player,
a
television
sound tuner, a child's
record
player
with
ceramic
pickup
cartridge,
or the
playback
signal
from
a second tape deck.
6.
TAPE
PLAY/RECOFD. Two
types
of
conneclors
are
provided
for
use with a
Stereo
tape recorder:
separate
pairs
ol
FECORD
and PLAY
phono
jacks,
and
a
live-pin
DIN
socket.
lf
your
recorder
has only
DIN-type
plugs,
use the
DIN
connector.
It
your
rscorder has
both a DIN
plug
and
pairs
ol
phono plugs,
il is
preferable
to use
the
phono plug
connoctions.
(Do
not
use
bolh
the
phono plugs
and the DIN
plug
simultaneously.)
The tape
connections
may
be
used with
tape
recorders
ol all
kinds:
cassetle,
open-reel, eighftrack, Elcaset,
digital,
etc. To
make
recordings, connect
a ster€o
patch
cord from
lhe BECORD
jacks
to
the
LINE
or BADIO input
jacks
on lhe
recorder (not
to its microphone
inputs). To
play
back tapes,
connect a ster€o
patch
cord
from
the recorder's
LINE
output
iacks
lo
the 30204s PLAY inouts.
Z PRE-AMP
OUT, NORMAL
lN, LAB lN.
Each
channel
ol the
amplifier is comprised
ol two independent
sections or
stages:
the
conlrol
preamplifier
(including
the
phono
preamp
and most
front-panel
controls),
and the
power
amplilier
(which
provides
lhe
power
to
dnve loudspeakers).
ln normal
operation
the
preamp
and
power
amp
are
connected
to-
gether
via
U-shaped metal
jumpers
I
check to
be sure
thai
they
are fully inserted into
the
jacks
and that nothing
is
touching
them.
Two
sets
of
power
amp inputs
are
provided.
The LAB
inputs have
wideband frequency
response
extending
uni-
formly from low
infrasonic
tc high
ullrasonic frequencies,
and may
be used lor laboralory
tests and
special
applica-
tions. The
NOBMAL inputs
are
equipped
with
infrasonic
and
ultrasonic lilters
to
reject interference
occurring
outside ol
the audible frequency
range,
minimizing intermodutation
distortion
and
preserving
the
amplifier's
power
lor
music
For
conventional
operation the PRE-AMP
OUT
iacks
are
connected
to
the
NORMAL lN
lacks
by means
of the
metal
jumpers.
Removal of the
jumperc
(wi{h
the POWER
switched
OFn enables various
signal-processing
acces-
sories to
be
connected
in
the
signal
path
between
preamp
and
power
amp:
a
special
speaker
equalizer
(such
as lhat
supplied with
certain
Bose
and
Electro-Voice sOeakers).
a
graphic
equalize( a dynamic-range
expander, a time-detay
ambrence reproduclion
system,
etc. To use a
signal
proces-
sor, connect
a slereo
patch
cord
from
the PRE-AMP
OUT
iacks
to the
processor's
line,level input
jacks,
and connect a
second
patch
cord
from
the
processor's
line-level
outputs to
the NORMAL
lN
jacks.
NOTE:
Any signal
processor
whose operation
depends
on the
setling
ol a
threshold.
such as dynamtc noise
filter or
DBX
decode(
should be connected
to the TAPE
RECOFIo/
PLAY
jacks-where
the
signal Ievels are
unatfected
by
volume
and tone
controls-rather
than
to
the PBE-AMP
OUT
iacks.
Save the metaljumpers
in
case
you
may want
to
disconnect
the
signal
processor
and return to normal
operation
al
a
laler time.
lf the
jumpers
should
be
lost,
a
conventional
slereo
patch
cord can
be
used to
connect
PFE-AMP
OUT
to
either
NORMAL
tN or LAB tN.
The
NAO
30204 can
be used as
rhe
heart
of an
elaborate
audiophile sound
syslem. For example the
PFE-AMP
OUT
jacks
may
be connected via
a stereo
palch
cord to
any high-quality
separate
power
amplilier
To
use
a
separate
high-power
amplifier for
your
main
stereo speakers
while
continuing
to use the NAD
3020As built-in
power
amp
lor
headphones
or
extension
speakers, simply install
y-con-
nector
adapters
to split the
signal
from
the PHE-AMP
OUI
jacks.
The
preamp
stage is
capable
ol
driving
several
power
amplifiers in
parallel,
or the long
signal cables required
lo
connect
to
power
amps which
are located near the
speak,
ers,
or to
"powered"
loudspeakers
with built-in
power
amps.
The
preamp
outpul can
be used to
drive a
time-delay
ambi-
ence system,
with
the
3020As
builfin
power
amp used to
drive
either
the main stereo
speakers or the time-delayed
secondary
speakers.
And
in
an elaboral€ bi-ampiilied
sys-
tem
lhe
preamp
output would
b€ led to the input
ot the
electronic
crossover
while
the highJrequency
output
of the
crossover
unit
is fed io
the NORMAL
lN or LAB lN
jacks
and the
speaker's
tweeters are
connected directly to the
SPEAKER
lerminals.
8. SPEAKERS. lf the
wiring
to each
speaker
will
be
no longer
than
about
20 feet
(6
meters), then
conneclions
should
be made
using
18-gauge
wire
such
as
common lamp
cord
("zip"
cord),
available
lrom
hardware and
electrical,
supply stores in
either
white,
brown,
or
black insulation.
The
smaller-diameter
20- or 22-gauge
wire
sold in
some
shops
is rol recommended,
even
though it
may
be identified
as
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